Abstract: An armrest includes a base member serving as a framework, a cushioning pad provided on the base member, a cover wrapping the base member and the cushioning pad, and a planar heater disposed such that an electric heating wire is laid between the cushioning pad and the cover. The base member has an outer peripheral surface having a curved surface that is curved downward from an upper surface of the base member. The cushioning pad has a curved cover that covers the outer peripheral surface of the base member across the upper surface and the curved surface. The heater has a curved portion disposed such that the heating wire is laid between the curved cover and the cover.