To provide a piano handle type switch device excellent in installation by enabling push-button switches, with piano handles kept mounted thereon, to be mounted on a mounting frame.

Piano handles 43 each have a size formed so that the size of a projection image projected onto a front portion of a cover projecting forward from an open window 2a in a mounting frame 2 substantially equal to that of the front portion, and when push-button switches 5 are fitted into the open window 2a in the mounting frame 2, they can be fitted thereinto with the piano handles 43 kept mounted thereon. When the three push-button switches 5 are mounted in the mounting frame 2, the piano handles 43 mounted on the push- button switches 5 are arranged side by side, and the projection images of the three piano handles 43 approximate the opening size of the open window 2a in the mounting frame 2.