KEY TYPE SELECTOR SWITCH

PURPOSE: To improve the efficiency of the assembling work by preventing the groove plates inserted into plural grooves provided on a rotor case from being released from the grooves. CONSTITUTION: Four projections 141 are provided at end sections on both sides in the peripheral direction of a groove plate 14A, and small grooves 152 to be coupled with the projections 141 are provided on a groove 151A. When the groove plate 14A is inserted into the groove 151A from above, the projections 141 are coupled with the small grooves 152, the radial movement of the groove plate 14A is restricted, and the groove plate 14A is not released.