An intermediate member includes: a base section including a fixing portion provided on a circuit board along the outer periphery of a switch section, and a cylindrical held portion formed integrally with the upper end of the fixing portion; a operator portion operable to drive the switch section; and a resilient connection portion resiliently connecting the operator portion to the base section. A panel member and the circuit board are fixed in face-to-face pressed engagement with each other with the intermediate member sandwiched therebetween. The operator portion is partly exposed out of an opening portion formed in the panel member, the held portion is held fitted with a cylindrical holding portion provided on the lower surface of the panel member, and the fixing portion is sandwiched between the lower end of the holding portion and the upper surface of the circuit board.