A mounting structure of a housing 11 for a concentrator photovoltaic module 1M includes: a bottom plate 15 framed from an electric conductor and having a plurality of cells 12c arrayed thereat; a side wall frame 16 made of resin, the side wall frame 16 standing along the outer edge of the bottom plate 15 and configured to hold a concentrating portion 13 so as to face the bottom plate 15; a pair of the frames 8 (support member) each being a grounded electric conductor, the pair of the frames 8 configured to be in contact with the bottom plate 15 to support the module 1M; and bolts 25 and nuts 26, as a fastening member, configured to fasten the pair of the frames 8 and the bottom plate 15 to each other thereby to fix the module 1M to the pair of the frames 8, the bolts 25 and the nuts 26 each being an electric conductor thereby to serve as paths for electric connection from the bottom plate 15 to the pair of the frames 8.