Embodiments of the present invention may include a vehicle seat having a back frame, a frame member, a sheet member, a cushion pad and a regulation structure. The back frame has a generally rectangular shape. The frame member has a shape corresponding to a part of the back frame. The sheet member is attached to the frame member in a tensioned state. The cushion pad is mounted on a front surface of the frame member. The regulation structure is provided on the frame member and the cushion pad. The regulation structure is configured to prevent the cushion pad from shifting along the front surface of the frame member.