PROBLEM TO BE SOLVED: To provide an attachment which has excellent impact resistance so that it hardly comes off from a device even when subjected to an impact.SOLUTION: A first cover 11 has an outside engagement part 31 and a grip part accommodation part 21 capable of accommodating a part of a grip part 1a. A second cover 12 has an inside engagement part 32 and the grip part accommodation part 21 capable of accommodating the other part of the grip part 1a. A positioning structure is configured in which the first cover 11, the second cover 12 and a grip push button type slave unit 1 are positioned with each other by, in a state where the first cover 11 and the second cover 12 are mounted on the grip push button type slave unit 1, an inner wall surface 21a of the grip part accommodation part 21 of the first cover 11 and the inner wall surface 21a of the grip part accommodation part 21 of the second cover 12 coming into contact with an outer peripheral surface of the grip part 1a, by the inside engagement part 32 being fitted to a recess part 50 formed with a lateral surface of the outside engagement part 31 and the outer peripheral surface of the grip part 1a, and by the outside engagement part 31 being engaged with the inside engagement part 32.SELECTED DRAWING: Figure 9
