SEAT CUSHION

A seat cushion includes a cushion rear portion forming a rear portion of the seating surface, a cushion front portion forming a front portion of the seating surface and being configured to approach and separate from the cushion rear portion in a front-rear direction by a cushion length variable mechanism, a cushion cover covering the cushion front portion and the cushion rear portion, a retraction member disposed over a cover back surface of the cushion cover to a first member, and a push-in member provided on a second member, and configured to push the retraction member by the cushion front portion approaching the cushion rear portion, thereby retracting the cushion cover into a gap between the cushion front portion and the cushion rear portion with the retraction member.