Renovation, reverse mortgages and rental are being conducted as methods of utilizing existing houses, but both methods have disadvantages and are inadequate. Using “Fixed term lease contract” and “Lifetime lease contract”, the existing housing should be utilized mainly by leasing for the elderly. As for the “Spouse's residence rights” that newly occurred due to the revision of the Civil Code, there is an effect of increasing the liquidity of existing houses and reducing them, so active discussion is expected on how to utilize them.