To provide a clip allowing an easy work for the mounting and demounting thereof, as well as reuse, and solar battery module mounting structure using the clip.

A clip is formed out of a first and a second insertion parts 51 and 52 having a base end gap set larger than the breadth of a slit 31a in a natural condition, with the gap gradually narrowed toward the forward ends and the forward ends connected to each other, a first and a second lock parts 53 and 54 extended from the base ends of the first and the second insertion parts 51 and 52 in a direction for nearing each other, and formed to be capable of respectively coming in contact with the corners of the opposed walls of the slit 31a, and superposed parts 55 and 56 made continuous to a first and a second lock parts 53 and 54, and overlapped each other. Also, the first and the second superposed parts 55 and 56 are formed to have a first and a second holes 57 and 58 superposed in part in a natural condition, and formed so that the slopes 53a and 54a so as to move the first and the second lock parts 53 and 54 along a direction for parting from the walls of the slit 31a, when the superposed parts 55 and 56 are made to move along a direction for expanding the superposed part.