# 少年法 / Juveniles Act — 附　則 (Supplementary Provisions)

This is the Markdown twin of https://japanlaw.org/en/juvenile-act/suppl-3291-163. Every law, and how to address a provision: https://japanlaw.org/llms.txt. The same laws as MCP tools (no sign-in): https://japanlaw.org/mcp.

- Law: 少年法 (Juveniles Act), 昭和二十三年法律第百六十八号
- English title "Juveniles Act": Ministry of Justice translation
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 附　則 (Supplementary Provisions) — address `suppl-3291-163`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/en/juvenile-act/suppl-3291-163
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/323AC0000000168/suppl-3291-163
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

---

## 附　則 昭和二九年六月八日法律第一六三号
<sup>suppl-3291-163 · https://japanlaw.org/en/juvenile-act/suppl-3291-163 · https://japanlaw.org/l/323AC0000000168/suppl-3291-163</sup>

**第一項**  この法律中、第五十三条の規定は交通事件即決裁判手続法の施行の日から、その他の部分は、警察法（昭和二十九年法律第百六十二号。同法附則第一項但書に係る部分を除く。）の施行の日から施行する。
<sup>suppl-3291-163/par-1 · https://japanlaw.org/en/juvenile-act/suppl-3291-163/par-1 · https://japanlaw.org/l/323AC0000000168/suppl-3291-163/par-1</sup>
Of this Act, the provisions of Article 53 come into effect as of the date on which the Act on Summary Trial Procedures for Traffic Cases comes into effect, and the other parts come into effect as of the date on which the Police Act (Act No. 162 of 1954; excluding the part pertaining to the proviso to paragraph (1) of the Supplementary Provisions of the same Act) comes into effect.
<sup>machine translation, not official</sup>

---

## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 少年法 — the text in force from 2026-06-24 (https://laws.e-gov.go.jp/law/323AC0000000168/20260624_508AC0000000046), retrieved 2026-11-02
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Juveniles Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/4827/tb), retrieved 2026-11-02
- claude-sonnet-5-5 — Machine translation, batch juvenile-act-20261102T172711-003, translated 2026-11-03
- This site's parser, version 220 — 少年法 — structure, counts, cross-references and defined terms, computed 2026-11-02