Provided is a power generation apparatus, which includes an internal combustion engine, and a rotary electric machine disposed adjacent to the internal combustion engine in an axial direction. The rotary electric machine includes coils to which an electric current is supplied from an external power apparatus via an electric power supply cable. Terminal parts connected to the coils and connection terminals of the electric power supply cable are connected in a predetermined connection space that is formed in part of a lower block of an engine block of the internal combustion engine.