A holder includes stoppers that restrict movement of an operation member in a predetermined direction by an amount exceeding a predetermined amount by abutting against a projection of the operation member when the operation member is moved in the predetermined direction. The operation member is made from an elastic body to be movable between the first position and the second position, in a case where the operation member is present at a position either the first position or the second position, when a force is applied to the operation protrusion in a direction perpendicular to the predetermined direction, the main body is bent in the perpendicular direction and the projection moves over the stopper.