A storage assist device for a vehicle seat selectively changes in position between a use and a storage position. The device includes a supporting member for supporting a rotating shaft fixed to the seat cushion; a link member having a fixed portion fixed to the rotating shaft and an engagement portion provided at a position spaced from the fixed portion; a fixing member provided on the vehicle body floor side and disposed at a predetermined distance from the rotating shaft; and an urging spring mounted in a tensioned condition between the engagement portion of the link member and the fixing member that can apply the urging force in the urging direction. The link member is fixed to the rotating shaft such that the entire length of the urging spring is shortest when the seat center of gravity is located on a vertical surface including the rotating shaft.