# 民法 / Civil Code — 第六章 (Part 1, Chapter 6)

- Law: 民法 (Civil Code), 明治二十九年法律第八十九号
- English title "Civil Code": 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: 第六章 (Part 1, Chapter 6) — address `pt-1/ch-6`
- Text in force since: 2026-06-24
- URL (the page that opens at this provision): https://japanlaw.org/ja/civil-code/pt-1/ch-6
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/129AC0000000089/pt-1/ch-6
- 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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## 第六章　期間の計算 — Chapter VI Computation of Period of Time
<sup>heading: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>pt-1/ch-6 · https://japanlaw.org/ja/civil-code/pt-1/ch-6 · https://japanlaw.org/l/129AC0000000089/pt-1/ch-6</sup>

### 第百三十八条（期間の計算の通則） — (Common Rules on Computation of Period of Time)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-138 · https://japanlaw.org/ja/civil-code/art-138 · https://japanlaw.org/l/129AC0000000089/art-138</sup>

  **第一項**  期間の計算方法は、法令若しくは裁判上の命令に特別の定めがある場合又は法律行為に別段の定めがある場合を除き、この章の規定に従う。
  <sup>art-138/par-1 · https://japanlaw.org/ja/civil-code/art-138/par-1 · https://japanlaw.org/l/129AC0000000089/art-138/par-1</sup>
  The method of computation of a period of time is governed by the provisions of this Chapter unless otherwise provided in the laws and regulations or a judicial order, or unless otherwise provided for by the relevant juridical act.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

### 第百三十九条（期間の起算） — (Commencement of Period)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-139 · https://japanlaw.org/ja/civil-code/art-139 · https://japanlaw.org/l/129AC0000000089/art-139</sup>

  **第一項**  時間によって期間を定めたときは、その期間は、即時から起算する。
  <sup>art-139/par-1 · https://japanlaw.org/ja/civil-code/art-139/par-1 · https://japanlaw.org/l/129AC0000000089/art-139/par-1</sup>
  When a period is provided for in hours, the period commences immediately at the specified time.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

### 第百四十条
<sup>art-140 · https://japanlaw.org/ja/civil-code/art-140 · https://japanlaw.org/l/129AC0000000089/art-140</sup>

  **第一項**  日、週、月又は年によって期間を定めたときは、期間の初日は、算入しない。ただし、その期間が午前零時から始まるときは、この限りでない。
  <sup>art-140/par-1 · https://japanlaw.org/ja/civil-code/art-140/par-1 · https://japanlaw.org/l/129AC0000000089/art-140/par-1</sup>
  When a period is provided for in days, weeks, months, or years, the first day of the period is not included in the computation; provided, however, that this does not apply when the period commences at twelve midnight.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

### 第百四十一条（期間の満了） — (Expiration of Period)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-141 · https://japanlaw.org/ja/civil-code/art-141 · https://japanlaw.org/l/129AC0000000089/art-141</sup>

  **第一項**  前条の場合には、期間は、その末日の終了をもって満了する。
  <sup>art-141/par-1 · https://japanlaw.org/ja/civil-code/art-141/par-1 · https://japanlaw.org/l/129AC0000000089/art-141/par-1</sup>
  In the case referred to in the preceding Article, the period expires at the end of the last day.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

### 第百四十二条
<sup>art-142 · https://japanlaw.org/ja/civil-code/art-142 · https://japanlaw.org/l/129AC0000000089/art-142</sup>

  **第一項**  期間の末日が日曜日、国民の祝日に関する法律（昭和二十三年法律第百七十八号）に規定する休日その他の休日に当たるときは、その日に取引をしない慣習がある場合に限り、期間は、その翌日に満了する。
  <sup>art-142/par-1 · https://japanlaw.org/ja/civil-code/art-142/par-1 · https://japanlaw.org/l/129AC0000000089/art-142/par-1</sup>
  If the last day of a period falls on a Sunday, a holiday as provided in the Act on National Holidays (Act No. 178 of 1948), or any other holiday, only when it is customary not to do business on the relevant day, the period expires on the immediately following day.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

### 第百四十三条（暦による期間の計算） — (Computation of Period with Reference to Calendar)
<sup>caption: Ministry of Justice translation — Japanese Law Translation Database System</sup>
<sup>art-143 · https://japanlaw.org/ja/civil-code/art-143 · https://japanlaw.org/l/129AC0000000089/art-143</sup>

  **第一項**  週、月又は年によって期間を定めたときは、その期間は、暦に従って計算する。
  <sup>art-143/par-1 · https://japanlaw.org/ja/civil-code/art-143/par-1 · https://japanlaw.org/l/129AC0000000089/art-143/par-1</sup>
  If a period is provided for in weeks, months, or years, the period is calculated in accordance to the calendar.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

  **第二項**  週、月又は年の初めから期間を起算しないときは、その期間は、最後の週、月又は年においてその起算日に応当する日の前日に満了する。ただし、月又は年によって期間を定めた場合において、最後の月に応当する日がないときは、その月の末日に満了する。
  <sup>art-143/par-2 · https://japanlaw.org/ja/civil-code/art-143/par-2 · https://japanlaw.org/l/129AC0000000089/art-143/par-2</sup>
  If a period does not commence at the beginning of the week, month, or year, that period expires on the day immediately preceding the day which corresponds to the commencement day in the last week, month or year; provided, however, that if the period is provided for in months or years and the last month does not contain a corresponding day, the period expires on the last day of that month.
  <sup>Ministry of Justice translation — Japanese Law Translation Database System</sup>

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## Cites
- art-141/par-1: 前条 → 民法 第百四十条 (Article 140), art-140 — https://japanlaw.org/ja/civil-code/art-140 · https://japanlaw.org/l/129AC0000000089/art-140

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 民法 — the text in force from 2026-06-24 (https://laws.e-gov.go.jp/law/129AC0000000089/20260624_508AC0000000045), retrieved 2026-10-11
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Civil Code — Ministry of Justice translation (part 1 of 2) (https://www.japaneselawtranslation.go.jp/en/laws/view/4848/tb), retrieved 2026-10-11
- This site's parser, version 190 — 民法 — structure, counts, cross-references and defined terms, computed 2026-10-11