To provide a key-shaped selector switch composed by standardizing an assembly component of a key operation unit.

In this key-shaped selector switch, the key operation unit comprises an assembly of a frame 5, a ring-like grooved rotor case 3 stored and held in a pipe part of the frame 5, and a cylinder 2 fitted in the rotor case 3 after attaching a tumbler 4 thereto; and is structure such that a key extraction position allowing a key 1 to be extracted from the cylinder 2 is selectively designated by aligning it with a contact changeover notch of a contact unit. In the key operation unit, first to fourth grooves 3a-1 to 3a-4 are formed on the inside surface of the rotor case 3, thereafter spline teeth 3c are formed on the outer peripheral side of the case in line with pitch intervals of notch positions, and key grooves 5a for fitting the spline teeth 3c thereto are formed on the inner periphery of the pipe part of the frame 5.