To enable to reduce the number of parts, and also to reduce assembling man-hours, and further to reduce the cost to assemble.

At the lower case 13, the first to the fifth press-operating parts 16 to 20 press-operated by a operating lever 23 are integrally formed. Further, at a plate-formed contact member 42 mounted on the upper face of a wiring substrate 34, the first to the fifth movable contact points 45 to 49 press-operated by the first to the fifth press-operating parts 16 to 20 are integrally formed.