KEY SWITCH

PROBLEM TO BE SOLVED: To provide a key switch which enables reduction of the number of parts and improvement of assembling workability. SOLUTION: The key switch is provided with an elevating key-top 2, an upper case 5 having a boss hole 5b which can axially support a support axis 2c formed at the key-top 2, and a membrane switch 6 having a switching circuit changing over contacts according to rise and fall of the key-top 1. The key-top 2 is linked up with a linking part 4 to a support plate 3 having a through-hole 3a for a support shaft 2c to penetrate into, where, the support shat 2c is axially supported by the boss hole 5b in free sliding and at same time, the key-top 2 is elastically biased by the linking part 4 in the direction getting away from the support plate 8, so that, when the key-top 2 is pressed, the support shaft 2c presses the membrane switch 6 to enable to change over contacts of the switching circuit.