The policy of retirement pension in Japan does not restrict employers’ duties. However, by taxes-reduction or retirement subsidies, employers are encouraged to fulfill his duties. Now there are some schemes such as mutual aids for medium/small enterprises, or for business of unique categories for retirement allowance, Employees Pension Fund, tax-qualified pension plan, Fund type enterprise pension, contract type enterprise pension, corporate-defined contribution pension plan, etc. Schemes related to medium and small enterprises, business of special categories, part-time labors which erect retirement pension mutual aid, as well as Employees Pension Fund activated in both public and private fields with social security, are valuable reference for our country in revising laws related.