Appellate Procedure in Japan

Introduction

The Japanese appellate system is structured around a three-tier court hierarchy that mirrors the continental European model, though it incorporates features unique to Japan’s constitutional framework. The first instance is heard by the District Court (Chihō Saibansho) in most civil and criminal matters; the first appeal (kōso) lies to the High Court (Kōtō Saibansho); and the final appeal (jōkoku) lies to the Supreme Court (Saikō Saibansho). This architecture is established by the Court Act (Saibansho Hō, 1947) and elaborated in the Code of Civil Procedure (CCP), the Code of Criminal Procedure (CCrP), and the Administrative Case Litigation Act.

The First Appeal: Kōso

Availability. A kōso appeal is available to any party aggrieved by a final judgment of a District Court, a Family Court, or a Summary Court (in the case of civil appeals from Summary Courts, the appeal lies to the District Court, not the High Court). In criminal cases, the defendant has an automatic right of kōso against a conviction (Article 372 CCrP).

Grounds. The grounds for kōso are set out in Article 312 CCP (civil) and Articles 377–383 CCrP (criminal). They include:

• Misapplication of law — an error in the interpretation or application of a statute.
• Serious procedural errors — such as improper composition of the court, violation of the rules on public hearing, or failure to give reasons in the judgment.
• Errors of fact — in civil cases, the appellate court may review factual findings, but only where the finding is “contrary to the evidence” or “unreasonable” (Article 312(2) CCP). In criminal cases, the High Court reviews factual findings more broadly and may reverse if the finding is “contrary to the evidence” or if the judgment is “unjust” (Article 382 CCrP).
• Inadequate reasoning — a failure to provide sufficient reasons for a finding of fact or a conclusion of law.

Procedure. The appellant must file a notice of kōso within two weeks of service of the judgment (Article 285 CCP; Article 373 CCrP). The written kōso must specify the grounds of appeal. The respondent may file a written reply. The High Court may hold oral argument or, in certain civil appeals where the grounds are plainly unfounded, may dismiss the appeal summarily (Article 306 CCP).

Scope of Review. In civil cases, the High Court reviews the case both on the record and, in limited circumstances, on fresh evidence (Article 303 CCP). The court may affirm, modify, or reverse the judgment. In criminal cases, the High Court reviews the record de novo and may acquit, convict of a lesser offence, or remit the case to the District Court.

The Final Appeal: Jōkoku

Availability. A jōkoku appeal lies from a High Court judgment to the Supreme Court. It is available as of right only on limited grounds; otherwise, the Supreme Court exercises discretionary review akin to certiorari in the United States.

Grounds. Article 318 CCP (civil) and Article 405 CCrP (criminal) specify the grounds:

• Constitutional error — a misinterpretation or violation of the Constitution of Japan.
• Conflict with Supreme Court precedent — the judgment is inconsistent with a decision of the Supreme Court.
• Matters of legal importance — in civil cases, the Supreme Court may grant jōkoku if the case involves “a matter of law of general importance” (Article 318(2) CCP), even if no constitutional issue is raised.

Procedure. The appellant must file a petition for jōkoku (jōkoku mōshitake) within two weeks of service of the High Court judgment. The petition must identify the specific grounds. The Supreme Court’s five-Justice Petty Benches (shōhōtei) review the petition. If the Court finds that the case does not warrant review, it denies jōkoku by a summary order. The denial rate exceeds 95%.

Scope of Review. The Supreme Court’s review is limited to questions of law. It does not reweigh evidence or disturb findings of fact unless those findings are based on a legally erroneous standard. When the Court grants jōkoku, it may hold oral argument, but most appeals are decided on the briefs.

The Special Appeal: Kōkoku

Kōkoku is a distinct appellate mechanism used against interlocutory orders and rulings — such as orders on provisional remedies, decisions on jurisdiction, and orders relating to enforcement. The kōkoku system operates in both civil and criminal contexts. In civil proceedings, a kōkoku appeal lies to the High Court against specified procedural orders; a further kōkoku may lie to the Supreme Court in exceptional cases (Article 337 CCP).

The Supreme Court in Detail

Composition. The Supreme Court comprises fifteen Justices, including the Chief Justice. The Chief Justice is appointed by the Emperor on the nomination of the Cabinet; the other Justices are appointed by the Cabinet. Justices must be “persons of broad vision and extensive knowledge of law” (Court Act, Article 41). At least ten Justices must have served as judges, prosecutors, or practising lawyers.

Grand Bench and Petty Benches. The Court sits in the Grand Bench (daihōtei) when hearing constitutional cases or when overruling or modifying a prior precedent. The Grand Bench requires all fifteen Justices (a quorum of nine). All other appeals are heard by one of three Petty Benches (shōhōtei), each composed of five Justices.

Case Selection. The Supreme Court exercises strict control over its docket. In civil cases, approximately 3,000–4,000 petitions for jōkoku are filed each year, of which about 200–300 are granted. In criminal cases, the number of petitions is smaller, and the grant rate is similarly low.

Appeals in Special Contexts

Administrative Cases. Appeals in administrative cases follow the same kōso–jōkoku structure, though the Administrative Case Litigation Act imposes specific time limits and standing requirements. The High Court hears kōso appeals from District Court judgments in administrative cases. The Supreme Court may hear jōkoku appeals on questions of law.

Family Court Appeals. A party aggrieved by a Family Court adjudication (shinpan) may appeal to the High Court by way of kōkoku. A further kōkoku lies to the Supreme Court.

Labor Relations. Appeals from the Labor Relations Commission are heard in the first instance by the District Court (a “action for the revocation of the Commission’s order”). The normal kōso–jōkoku path then applies.

Duration of Appeals

The goal of the Japanese appellate system is to produce a final decision within two to three years of the first-instance judgment. The High Court typically disposes of a kōso appeal within six to twelve months. The Supreme Court’s discretionary denial of most petitions means that only a small fraction of cases undergo the full appellate process.