If an employer intends to dismiss a worker, the employer must provide at least 30 days' advance notice. An employer not giving 30 days' advance notice must pay the worker the average wage for at least 30 days; provided, however, that this does not apply if continuation of business has become impossible due to a natural disaster or any other unavoidable reason, or if the worker is dismissed for reasons attributable to that worker.
The number of days of advance notice referred to in the preceding paragraph may be shortened if the employer pays the worker the average daily wage they would earn for each day by which the advance notice period is shortened.
The provisions of paragraph (2) of the preceding Article apply mutatis mutandis to the case referred to in the proviso to paragraph (1).
略称規定第九条第一項
この法律で「労働者」とは、職業の種類を問わず、事業又は事務所（以下「事業」という。）に使用される者で、賃金を支払われる者をいう。
定義第十二条第一項・法令全体に適用
これを算定すべき事由の発生した日以前三箇月間にその労働者に対し支払われた賃金の総額を、その期間の総日数で除した金額
わかりやすく言うと
計算の理由が生じた日以前三か月間に支払われた賃金の総額を、その期間の総日数で割った金額です。日給や時間給、出来高払いなどの場合は、賃金の総額を働いた日数で割った額の百分の六十を下回ってはいけません。