A fixing member (3, 40, 43, 50, 53) which fixes a first frame body (1) of a solar battery module main body (9) slides along the first frame body, and the solar battery module main body includes a connecting portion (10) and a to-be connected portion (11) which connects the first frame bodies which are adjacent to each other through the fixing member. With this, a position of the fixing member can freely be moved with respect to the first frame body, the fixing member is slid to a position where there is a structure member (32) which supports a roofboard at predetermined intervals, and the fixing member is mounted at that position. With this, the fixing member can be mounted more strongly, and the adjacent two first frame bodies (31) can be fixed by the fixing member.