PURPOSE: To reduce a switch width and prevent a defect of a slide groove by supporting a slide member not to contact the slide groove, providing a member for preventing a backlash on the reverse face to the face on which an interfitting pawl is formed.

CONSTITUTION: The length of a support member 32 is set to be longer than the length from a printed board 15 to a slide groove 19 by (X), a slide switch 31 is supported in the state of being floated above from the slide groove 19 by (X) by means of the member 32. A pair of interfitting pawls 33a, 33b is formed on a tip part of the member 32 and fitted in a rib 34 provided in a basket unit 12 so that a fallout of the switch 31 off the groove 19 can be prevented. In addition, a rib 35 for preventing a backlash is provided on the reverse face to the face on which the interfitting pawls 33a, 33b are formed in the member 32. Thus, a switch width can be reduced, resulting in a smaller device. In addition, the slide groove can be prevented from being marred, and the external appearance quality can be improved.