An installation structure of a solar cell module comprising: a solar cell module including a solar panel, an eaves-side frame in a long shape holding an edge on an eaves side, a ridge-side frame in a long shape holding an edge on a ridge side opposite to the edge on the eaves side, and a lateral frame in a long shape holding edges of the solar panel different from the above edges; and a fixing member fixed to a predetermined structural member in a roof at a position on a ridge side further than the ridge-side frame and configured to prevent the ridge-side frame from moving towards the ridge side of the roof and in a direction perpendicular to a surface of the solar panel, the eaves-side frame of another solar cell module being positioned above the ridge-side frame and supported by the fixing member from outside.