A system comprising a photovoltaic module and a mounting structure for the photovoltaic module, the photovoltaic module comprising: a plurality of power generating elements; and a housing having a metal bottom plate on which the plurality of power generating elements are arrayed, and a resin side wall frame standing along an outer edge of the bottom plate, the mounting structure comprising: a support plate having a support face configured to be in contact with an outer face of the metal bottom plate in the housing of the photovoltaic module to support the photovoltaic module; a washer to be disposed on one face which is an inner face of the bottom plate or a face, of the support plate, at a side opposite to the support face; a rivet having a shank portion and a head, the shank portion being configured to be passed through the support plate and the bottom plate to be inserted into the washer, the head formed at one end portion of the shank portion, the rivet being configured to sandwich and fasten the support plate and the bottom plate between the washer and the head by an other end portion of the shank portion being deformed so as to have an enlarged diameter, wherein the support plate is an electric conductor that is grounded, the rivet and the washer are each an electric conductor that serves as a path for electrical connection from the bottom plate to the support plate, wherein the washer is disposed at a predetermined portion in the inner face of the bottom plate, and an end portion at the bottom plate side of the resin side wall frame standing along the outer edge of the bottom plate in the housing forms a recessed portion which is recessed to an inner side of the housing such that the predetermined portion is located at an outer side of the side wall frame. the photovoltaic module comprising: a plurality of power generating elements; and a housing having a metal bottom plate on which the plurality of power generating elements are arrayed, and a resin side wall frame standing along an outer edge of the bottom plate, a plurality of power generating elements; and a housing having a metal bottom plate on which the plurality of power generating elements are arrayed, and a resin side wall frame standing along an outer edge of the bottom plate, the mounting structure comprising: a support plate having a support face configured to be in contact with an outer face of the metal bottom plate in the housing of the photovoltaic module to support the photovoltaic module; a washer to be disposed on one face which is an inner face of the bottom plate or a face, of the support plate, at a side opposite to the support face; a rivet having a shank portion and a head, the shank portion being configured to be passed through the support plate and the bottom plate to be inserted into the washer, the head formed at one end portion of the shank portion, the rivet being configured to sandwich and fasten the support plate and the bottom plate between the washer and the head by an other end portion of the shank portion being deformed so as to have an enlarged diameter, wherein the support plate is an electric conductor that is grounded, the rivet and the washer are each an electric conductor that serves as a path for electrical connection from the bottom plate to the support plate, a support plate having a support face configured to be in contact with an outer face of the metal bottom plate in the housing of the photovoltaic module to support the photovoltaic module; a washer to be disposed on one face which is an inner face of the bottom plate or a face, of the support plate, at a side opposite to the support face; a rivet having a shank portion and a head, the shank portion being configured to be passed through the support plate and the bottom plate to be inserted into the washer, the head formed at one end portion of the shank portion, the rivet being configured to sandwich and fasten the support plate and the bottom plate between the washer and the head by an other end portion of the shank portion being deformed so as to have an enlarged diameter, wherein the support plate is an electric conductor that is grounded, the rivet and the washer are each an electric conductor that serves as a path for electrical connection from the bottom plate to the support plate, wherein the washer is disposed at a predetermined portion in the inner face of the bottom plate, and an end portion at the bottom plate side of the resin side wall frame standing along the outer edge of the bottom plate in the housing forms a recessed portion which is recessed to an inner side of the housing such that the predetermined portion is located at an outer side of the side wall frame.