Provided is a conveyance seat including a lateral support portion that provides good appearance. A lateral support portion of a seat back includes a base member that defines an outline of the lateral support portion and a surface cover arranged to cover the base member to form an outer surface of the lateral support portion. The surface cover includes multiple surface cover pieces interfaced with each other to form the surface cover and a strip-shaped body that extends out of the interface between the surface cover pieces in a reverse side portion of the surface cover. In a state where the surface cover covers the base member, the strip-shaped body is pulled toward a side of the base member opposite to that on which the interface is positioned with respect to the base member.