①A category 3 insured person prescribed in Article 7, paragraph (1), item (iii) of the National Pension Act (hereinafter referred to in this paragraph as a "category 3 insured person"), or a person who was a category 3 insured person, may notify the Minister of Health, Labour and Welfare with regard to a period, among that person's insured periods of the National Pension as a category 3 insured person before April 1, 2005, that is not included in the premium-paid period prescribed in Article 5, paragraph (1) of the National Pension Act (hereinafter referred to as the "premium-paid period") pursuant to the provisions of Article 7-3 of the Supplementary Provisions of the National Pension Act before the revision by the provisions of Article 2 (excluding an insured period of the National Pension as a category 3 insured person that is not included in the premium-paid period pursuant to the provisions of Article 7-2 of the Supplementary Provisions of that Act).

②If a notification has been made pursuant to the provisions of the preceding paragraph, then, notwithstanding the provisions of Article 7-3, paragraph (1) of the Supplementary Provisions of the National Pension Act after the revision by the provisions of Article 2, the period pertaining to the notification is included in the premium-paid period on and after the day on which the notification was made.

③If a person entitled to receive an old-age basic pension under the National Pension Act, or an old-age pension or aggregated old-age pension under the National Pension Act before the revision by the provisions of Article 1 of the 1985 Amendment Act, makes a notification under the provisions of paragraph (1), and the period pertaining to the notification is included in the premium-paid period pursuant to the provisions of the preceding paragraph, the amount of the pension is revised from the month following the month in which the day on which that notification was made falls.

④With regard to the application of the provisions of Article 18 of the Supplementary Provisions of the 1985 Amendment Act to a person for whom the period pertaining to the notification under paragraph (1) has been included in the premium-paid period pursuant to the provisions of paragraph (2), 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".