An armrest upper part covering an upper portion of an armrest lower part includes a front end portion adjacent to a switch finisher and an engagement claw portion extending from the front end portion. An upper part of the engagement claw portion is covered with the switch finisher. At the armrest lower part, a fixing portion for engagement with the engagement claw portion is provided. At a back surface of the switch finisher adjacent to a front of the armrest upper part and covering the upper portion of the armrest lower part, a restriction piece is provided at a position facing the fixing portion via the engagement claw portion. The restriction piece restricts detachment of the engagement claw portion from the fixing portion.