Employers and labor insurance administrative affairs associations must retain documents relating to employment insurance (excluding documents relating to employment stabilization programs or human resources development programs, and documents under the Labor Insurance Premium Collection Act or the Ordinance for Enforcement of the Act on the Collection, etc. of Insurance Premiums of Labor Insurance) for two years from the day of their completion (four years for documents relating to insured persons).
事業主及び労働保険事務組合は、雇用保険に関する書類（雇用安定事業又は能力開発事業に関する書類及び徴収法又は労働保険の保険料の徴収等に関する法律施行規則による書類を除く。）をその完結の日から二年間（被保険者に関する書類にあつては、四年間）保管しなければならない。
Read this with the articles around it
employermachine translation
「事業主」
In this Ordinance other than Article 130, the employer of a covered undertaking (適用事業).
Short name set inArticle 3, paragraph (1)· applies from here on, except in Article 130
Labor Insurance Premium Collection Actmachine translation
「徴収法」
Short name for the Act on the Collection, etc. of Insurance Premiums of Labor Insurance (Act No. 84 of 1969).
Short name set inArticle 17-6, paragraph (1)
insured personmachine translation
「被保険者」
In Article 118-2, paragraph (12), item (i)(c), an insured person of health insurance under the Health Insurance Act or of employees' pension insurance under the Employees' Pension Insurance Act.
Short name set inArticle 118-2, paragraph (12), item (i), (c)