①In this Act, the average wage means the amount of money calculated when the total amount of wages over the 3-month period preceding the day on which grounds for calculation of the average wage came into existence is divided by the total number of days during that period; provided, however, that the average wage must not fall below the amount calculated in any of the following ways:

②If there is a pay period end date, the period referred to in the preceding paragraph starts to be counted from the most recent pay period end date.

③If a period falling under one of the following items is a part of the period provided for in the preceding two paragraphs, the number of days constituting that period is excluded from the period referred to in the preceding two paragraphs and wages from during that period are excluded from the total amount of wages referred to in the preceding two paragraphs:

④Wages that have been paid on an ad hoc basis, wages that are paid every period of more than 3 months, and wages paid in a form other than currency and not falling within a certain scope are not included in the calculation of the total amount of wages referred to in paragraph (1).

⑤If wages are paid in a form other than currency, Order of the Ministry of Health, Labour and Welfare prescribes the necessary particulars in connection with the scope of the wages that are to be included in the calculation of the total amount of wages referred to in paragraph (1) and the assessment of their value.

⑥For a worker who has been hired less than 3 months prior, the period referred to in paragraph (1) means the period after the worker's hiring.

⑦The average wage for a person hired on a day-to-day basis is fixed by the Minister of Health, Labour and Welfare according to the kind of business or occupation in which that person is engaged.

⑧If an average wage cannot be calculated in accordance with paragraphs (1) through (6), the average wage is as prescribed by the Minister of Health, Labour and Welfare.