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

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- 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-4281-63`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/ja/juvenile-act/suppl-4281-63
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/323AC0000000168/suppl-4281-63
- 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.

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## 附　則 平成二八年六月三日法律第六三号
<sup>suppl-4281-63 · https://japanlaw.org/ja/juvenile-act/suppl-4281-63 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63</sup>

### 第一条（施行期日） — Effective Date
<sup>caption: machine translation, not official</sup>
<sup>suppl-4281-63/art-1 · https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1</sup>

**第一項**  この法律は、平成二十九年四月一日から施行する。ただし、次の各号に掲げる規定は、当該各号に定める日から施行する。
<sup>suppl-4281-63/art-1/par-1 · https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1/par-1 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1/par-1</sup>
This Act comes into effect on April 1, 2017; provided, however, that the provisions set forth in the following items come into effect on the dates specified respectively in those items:
<sup>machine translation, not official</sup>

  **一**  略
  <sup>suppl-4281-63/art-1/par-1/item-1 · https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1/par-1/item-1 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1/par-1/item-1</sup>
  Omitted
  <sup>machine translation, not official</sup>

  **二**  第一条の規定（前号に掲げる改正規定を除く。）、第三条の規定（売春防止法第三十五条第四項を削る改正規定を除く。）及び第六条の規定（同号に掲げる改正規定を除く。）並びに附則第九条の規定、附則第十八条中子ども・子育て支援法（平成二十四年法律第六十五号）附則第六条第二項の改正規定及び附則第二十一条の規定（前号に掲げる改正規定を除く。）　平成二十八年十月一日
  <sup>suppl-4281-63/art-1/par-1/item-2 · https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1/par-1/item-2 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1/par-1/item-2</sup>
  The provisions of Article 1 (excluding the amending provisions set forth in the preceding item), the provisions of Article 3 (excluding the amending provisions deleting Article 35, paragraph (4) of the Anti-Prostitution Act), and the provisions of Article 6 (excluding the amending provisions set forth in that item), and the provisions of Article 9 of the Supplementary Provisions, the amending provisions of Article 6, paragraph (2) of the Supplementary Provisions of the Act on Support for Children and Child-rearing (Act No. 65 of 2012) in Article 18 of the Supplementary Provisions, and the provisions of Article 21 of the Supplementary Provisions (excluding the amending provisions set forth in the preceding item): October 1, 2016.
  <sup>machine translation, not official</sup>

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## Cites
- suppl-4281-63/art-1/par-1/item-2: 前号 → 少年法 附則第一条第一項第一号 (Supplementary Provisions, Article 1, paragraph (1), item (i)), suppl-4281-63/art-1/par-1/item-1 — https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1/par-1/item-1 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1/par-1/item-1

## Cited by

1 provision cites this one. No official source publishes this direction.

- 少年法 附則第一条第一項第二号（施行期日） — https://japanlaw.org/ja/juvenile-act/suppl-4281-63/art-1/par-1/item-2 · https://japanlaw.org/l/323AC0000000168/suppl-4281-63/art-1/par-1/item-2

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## 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
- claude-sonnet-5-5 — Machine translation, batch juvenile-act-20261102T172711-005, translated 2026-11-03
- claude-sonnet-5-5, corrected on review by claude-opus-5-5 — Machine translation corrected on review, batch juvenile-act-20261102T172711-005, translated 2026-11-03
- This site's parser, version 220 — 少年法 — structure, counts, cross-references and defined terms, computed 2026-11-02