Provided is an electric connecting apparatus configured to dissipate heat generated from a contact itself via an insulating plate, a metallic enclosure, and a printed wiring board. The electric connecting apparatus includes at least a housing configured to accommodate multiple contacts. At least part of the housing is made of a material having high heat conductivity. The multiple contacts are arranged linearly in at least one row. The multiple contacts are in abutting contact with the at least part of the housing via at least an insulating member made of an electrically insulative material having high heat conductivity.