According to a method for mounting a plurality of solar battery modules, an underlying member (roofing member) is fixed at a location where the solar battery modules are to be mounted. The underlying member has a wiring made of conductive material that is formed for drawing electric power from the solar battery modules and has connection terminals at respective positions to be connected with each solar battery module. Connection terminals of each solar battery module are coupled with the connection terminals of the underlying member to fasten each solar battery module.