Patent ID: 7345252

Claim:
A key switch comprising: a switch case housing a switching device for executing an on-off operation and provided with a key insertion port for an operation key; a base head member rotatably supporting a cam device which is rotated forward and backward by inserting and pulling out the operation key, thereby making the switching device execute a contact point switching operation, the base head member being received in the switch case so as to make the cam device face to the key insertion port; a lock device maintaining a contact point switching state of the switching device on the basis of the insertion of the operation key; wherein a bridge fixedly holding a cam shaft holding the cam device is provided in a position close to the cam device of the base head member, and the base head member is fixedly held to the switch case; wherein a shaft bearing portion is further provided in the bridge of the base head member toward the outside of the bridge; and wherein the lock device locks a head plunger which is reciprocated on the basis of the rotation of the cam device so as to make the switching device execute the contact point switching operation, and a convex portion for guiding the head plunger, said convex portion protruding upwardly from a bottom portion of a cam device receiving portion.