To provide a structure for a push button actuator, capable of reducing the play of a handle and capable of preventing lowering of joint strength of the handle relative to a cover.

A plurality of mounting projections 11c are formed on a cover 11, mounting holes 12c, 12d, 12e are provided in a handle 12 for putting the mounting projections 11c therethrough, the mounting hole 12d in the middle is adapted to be a completely round reference hole while the mounting projection 11c corresponding to the mounting hole 12d is adapted to be a cylindrical reference projection, the diameter of the mounting hole 12d and the diameter of the reference projection or middle mounting projection 11c are made substantially the same, and the other mounting holes 12c, 12e are formed into elongate holes elongated in the arranging direction of the mounting holes.