What is the main job of a juge d’instruction?

The juge d’instruction in France is a magistrate who conducts the investigative hearing before a criminal trial. During this hearing, evidence is gathered, witnesses are heard, and depositions are taken. The juge d’instruction decides whether there is enough evidence to warrant a trial. They have the power to issue warrants, request expert testimony, and require witnesses to appear. The evidence and testimony make up a case dossier that guides the juge in the plenary hearing.

When does a juge d’instruction get involved in a criminal case?

In France, a juge d’instruction (examining magistrate) is a magistrate responsible for conducting the investigative hearing that precedes a criminal trial. The juge d’instruction handles a case only when ordered by the procureur (public prosecutor) or when requested by a private citizen. During the investigative hearing, evidence is gathered, witnesses are heard, and depositions are taken. The juge d’instruction has the power to issue warrants, request expert testimony, and ensure the accused has counsel and access to all documents and evidence. If the juge d’instruction is not convinced that there is sufficient evidence of guilt to warrant a trial, no trial will occur.

How does a juge d’instruction gather evidence during an investigation?

In France, a juge d’instruction (examining magistrate) gathers evidence by conducting investigative hearings before a criminal trial. During this hearing, the juge gathers and presents major evidence, hears witnesses, and takes depositions. To conduct the hearing, the juge d’instruction can issue warrants that allow authorities to search residences and seize evidence. They can also issue warrants for people to appear as witnesses or request expert testimony. If there are conflicting testimonies, the juge may confront witnesses with each other and the accused. The evidence and witness testimony make up a case dossier that guides the juge in the subsequent plenary hearing to verify testimony. The defense has access to the dossier to eliminate surprise elements from the main hearing. The juge d’instruction then decides whether to commit a case to trial based on the strength of the file.

What powers does a juge d’instruction have when investigating crimes?

In France, a juge d’instruction is a magistrate who conducts investigative hearings before a criminal trial. Appointed for renewable three-year terms by the president, they handle cases when ordered by the public prosecutor or requested by a citizen. During the hearing, the juge d’instruction has broad powers, including issuing warrants to search residences and seize evidence. They can also issue warrants for witnesses to appear or request expert testimony. Conflicting testimonies may lead to confrontations between witnesses and the accused. The evidence and testimonies form a dossier that guides the judge in subsequent hearings. If the juge d’instruction believes there is sufficient evidence, the case goes to trial. Otherwise, they may issue an order of non-lieu , meaning "no case".

How is the role of the juge d’instruction different from judges in other countries?

In France, a juge d’instruction is a magistrate who conducts the investigative hearing before a criminal trial, gathering evidence, hearing witnesses, and taking depositions. If the juge d’instruction is unconvinced that there is sufficient evidence of guilt to warrant a trial, no trial will occur. This differs from the Anglo-American system, where a grand jury only needs to find probable cause to return an indictment for trial. The juge d’instruction position was created in the mid-19th century. They are appointed by the president for three-year terms based on the recommendation of the Ministry of Justice. The juge d’instruction handles a case only if ordered by the procureur (public prosecutor) or when requested by a citizen. Once an investigation begins, the accused must be supplied with counsel, who must have access to all documents and evidence.

Juge d’instruction

Introduction References & Edit History Related Topics

Quick Facts

French:: judge of inquiry

Related Topics:: France; Judge

See all related content

Juge d’instruction

Q: What is a juge d’instruction in French law?

In French law, a juge d’instruction is a magistrate responsible for conducting the investigative hearing that precedes a criminal trial. This magistrate gathers and presents major evidence, hears witnesses, and takes depositions. If the juge d’instruction is not convinced that there is sufficient evidence of guilt to warrant a trial at the end of the proceedings, no trial will occur. The juges are appointed by the president for three-year terms, which are renewable, based on the recommendation of the Ministry of Justice. The juge d’instruction handles a case only if ordered by the procureur (public prosecutor) or when requested by a private citizen.

French law

Written and fact-checked by

Britannica Editors

Last updated

Nov. 1, 2026 •History

Top Questions

What is a juge d’instruction in French law?
In French law, a juge d’instruction is a magistrate responsible for conducting the investigative hearing that precedes a criminal trial. This magistrate gathers and presents major evidence, hears witnesses, and takes depositions.

If the juge d’instruction is not convinced that there is sufficient evidence of guilt to warrant a trial at the end of the proceedings, no trial will occur. The juges are appointed by the president for three-year terms, which are renewable, based on the recommendation of the Ministry of Justice. The juge d’instruction handles a case only if ordered by the procureur (public prosecutor) or when requested by a private citizen.
2 Britannica Sources
1. juge d’instruction
2. Definition of juge d'instruction
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What is the main job of a juge d’instruction?
The juge d’instruction in France is a magistrate who conducts the investigative hearing before a criminal trial. During this hearing, evidence is gathered, witnesses are heard, and depositions are taken. The juge d’instruction decides whether there is enough evidence to warrant a trial. They have the power to issue warrants, request expert testimony, and require witnesses to appear. The evidence and testimony make up a case dossier that guides the juge in the plenary hearing.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
When does a juge d’instruction get involved in a criminal case?
In France, a juge d’instruction (examining magistrate) is a magistrate responsible for conducting the investigative hearing that precedes a criminal trial. The juge d’instruction handles a case only when ordered by the procureur (public prosecutor) or when requested by a private citizen.

During the investigative hearing, evidence is gathered, witnesses are heard, and depositions are taken. The juge d’instruction has the power to issue warrants, request expert testimony, and ensure the accused has counsel and access to all documents and evidence. If the juge d’instruction is not convinced that there is sufficient evidence of guilt to warrant a trial, no trial will occur.
2 Britannica Sources
1. juge d’instruction
2. Definition of juge d'instruction
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How does a juge d’instruction gather evidence during an investigation?
In France, a juge d’instruction (examining magistrate) gathers evidence by conducting investigative hearings before a criminal trial. During this hearing, the juge gathers and presents major evidence, hears witnesses, and takes depositions.

To conduct the hearing, the juge d’instruction can issue warrants that allow authorities to search residences and seize evidence. They can also issue warrants for people to appear as witnesses or request expert testimony. If there are conflicting testimonies, the juge may confront witnesses with each other and the accused.

The evidence and witness testimony make up a case dossier that guides the juge in the subsequent plenary hearing to verify testimony. The defense has access to the dossier to eliminate surprise elements from the main hearing. The juge d’instruction then decides whether to commit a case to trial based on the strength of the file.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What powers does a juge d’instruction have when investigating crimes?
In France, a juge d’instruction is a magistrate who conducts investigative hearings before a criminal trial. Appointed for renewable three-year terms by the president, they handle cases when ordered by the public prosecutor or requested by a citizen.

During the hearing, the juge d’instruction has broad powers, including issuing warrants to search residences and seize evidence. They can also issue warrants for witnesses to appear or request expert testimony. Conflicting testimonies may lead to confrontations between witnesses and the accused. The evidence and testimonies form a dossier that guides the judge in subsequent hearings.

If the juge d’instruction believes there is sufficient evidence, the case goes to trial. Otherwise, they may issue an order of non-lieu, meaning "no case".
1 Britannica Source
1. juge d’instruction
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How is the role of the juge d’instruction different from judges in other countries?
In France, a juge d’instruction is a magistrate who conducts the investigative hearing before a criminal trial, gathering evidence, hearing witnesses, and taking depositions. If the juge d’instruction is unconvinced that there is sufficient evidence of guilt to warrant a trial, no trial will occur.

This differs from the Anglo-American system, where a grand jury only needs to find probable cause to return an indictment for trial. The juge d’instruction position was created in the mid-19th century. They are appointed by the president for three-year terms based on the recommendation of the Ministry of Justice. The juge d’instruction handles a case only if ordered by the procureur (public prosecutor) or when requested by a citizen. Once an investigation begins, the accused must be supplied with counsel, who must have access to all documents and evidence.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Juge d’instruction, in France, magistrate responsible for conducting the investigative hearing that precedes a criminal trial. In this hearing the major evidence is gathered and presented, and witnesses are heard and depositions taken. If the juge d’instruction is not convinced that there is sufficient evidence of guilt to warrant a trial at the end of the proceedings, no trial will occur. This process differs somewhat from the grand jury hearing in the Anglo-American system, under which the grand jury need find only probable cause in order to return an indictment for trial.

The preliminary investigative procedure was developed in France as early as the 17th century, but the position of juge d’instruction was not instituted until the mid-19th century. Juges are appointed by the president for three-year terms (which are renewable) upon the recommendation of the Ministry of Justice. The juge d’instruction handles a case only if ordered to do so by the procureur (public prosecutor) or when requested to do so by a private citizen. Once the juge d’instruction’s investigation has begun, the accused must be supplied with counsel, who must be given access to all documents and evidence. The hearing is structured to ensure the protection of the accused. Although he has a right to be heard, he may choose to remain silent.

In conducting the hearing, the juge d’instruction has a wide range of powers available. He may issue warrants allowing the authorities to search the accused’s residence and seize necessary evidence. He also may issue warrants requiring other people to appear as witnesses, or he may request experts to testify. If there is conflicting testimony, witnesses are confronted with each other and often with the accused. At the end of the hearing, the procureur may, if he chooses, present his opinion, in the form of a plea.

The evidence collected and the testimony of witnesses make up a case’s dossier, which serves as a guide for the juge in the subsequent plenary hearing in open court, particularly to verify testimony. It is available to the defense in its entirety so that the element of surprise, so prevalent in common-law trials, is eliminated from the main hearing. However, the dossier is not available to the jury, which must base its decision on the facts presented in open court. It is on the strength of this file that the juge d’instruction bases his decision as to whether to commit a case to trial. He may issue an order of non-lieu (French: “no case”), or, if he decides there is enough evidence for a trial, he will commit a case involving a serious misdemeanour or a lesser felony to the criminal court, whereas a major felony must first go to the chamber of accusation of the Court of Appeal (Cour d’Appel) for the pretrial hearing. If the Court of Appeal supports the juge’s recommendation, it will turn the case over to the Assize Court (Cour d’Assise), the only court in France with a jury.

Juge d’instruction

Thank you for signing up!