Key switch

A key switch, comprising:

• a cam member having side surfaces and a vertical rotation face on a rotation axis thereof rotating in accordance with insertion of a key adapted to be inserted into a key insertion opening on said key switch,
• a plunger coming into contact with a circumferential cam side of said cam member,
• a switch mechanism actuated by said plunger so as to be displaced in accordance with the rotation of said cam member, and
• a rotation lock mechanism for locking the rotation of said cam member when the key is pulled,
• said rotation lock mechanism comprising a pair of locking members each including a lock pin projecting to one of said side surfaces of said cam member which can be displaced in a direction parallel to the vertical rotation face of said cam member, an intermediate operating member which comes into contact with said locking member for moving said locking member, and a spring urging said locking member toward a position at which said pair of locking members can engage engagement portions on the cam member, said locking members being disposed to be displaced to a lock release position resisting said spring by displacing said intermediate operating member by the insertion of said key.