①The insured period as a category 3 insured person relating to a notification given under the provisions of Article 12, paragraphs (5) through (8), concerning a person who did not fall under Article 7, paragraph (1), item (iii) having become an insured person falling under the provisions of that item, or a notification given under the provisions of Article 105, paragraph (1) (including a case where the provisions of Article 12, paragraphs (6) through (8) are applied mutatis mutandis under paragraph (2) of that Article) concerning the spouse of an insured person falling under that item having, after losing status as an insured person of Employees' Pension Insurance, continuously become an insured person of Employees' Pension Insurance, for the months before the month that includes the day on which that notification was given (excluding the period falling within the two years up to and including the second month before the month that includes the day on which that notification was given) is not, notwithstanding the provisions of Article 5, paragraph (1), included in the premium-paid period.

②A category 3 insured person or a person who was a category 3 insured person may, where it is found that there is an unavoidable reason for the person's delay in giving the notification prescribed in the preceding paragraph, with respect to the period, among the insured periods of the person as a category 3 insured person, that is not included in the premium-paid period under the provisions of the preceding paragraph (excluding an insured period as a category 3 insured person that is not included in the premium-paid period under the provisions of the preceding Article), give a notification to that effect to the Minister of Health, Labour and Welfare.

③Where a notification is given under the provisions of the preceding paragraph, the period to which that notification relates is, notwithstanding the provisions of paragraph (1), included in the premium-paid period from and after the day on which that notification was given.

④Where a person entitled to receive an old-age basic pension gives a notification under the provisions of paragraph (2), and the period to which that notification relates is included in the premium-paid period under the provisions of the preceding paragraph, the amount of the pension is revised from the month following the month that includes the day on which that notification was given.

⑤For the purpose of applying the provisions of Article 18 of the Supplementary Provisions of the 1985 Amendment Act to a person for whom the period to which the notification under paragraph (2) relates has been included in the premium-paid period under the provisions of paragraph (3), the phrase "the insured period of the National Pension on and after that day" in paragraph (1) of that Article is deemed to be replaced with "the period included in the premium-paid period on and after that day".