A garnish includes a garnish body which covers a folded air bag and a locking portion which is inserted to be locked in a mounting hole in a mounting base on a vehicle body. The locking portion holds the garnish body which is pressed by the air bag when the air bag is inflated to move so as to form a projecting space for the air bag. The locking portion includes a locking main body portion which is inserted to be locked in the mounting hole and a connecting piece portion. The connecting piece portion includes a locking base portion on which the locking main body portion is provided, connecting portions which are connected to a rear surface of the garnish body, and deformable portions lying between the locking base portion and the connecting portions and is molded integrally with the garnish body. The deformable portions deform to extend a distance between the locking base portion and the connecting portion when the garnish body moves towards a vehicle interior side.