A switch cover is configured by having a first deformation portion that is connectively provided at a flat surface portion of a cylindrical portion placed to surround a periphery of a switch portion, and deforms by an external stress, a second deformation portion that is connectively provided at a curved surface portion of the cylindrical portion, and deforms by the external stress, and a stress transmitting portion that is connectively provided at the first and the second deformation portions, and transmits a stress having a component in a perpendicular direction to an outer surface of an operation portion main body to the switch portion when the first deformation portion is deformed inward of the cylindrical portion by the external stress.
