To provide an electric connection device made so as to radiate heat from a contact itself through an insulating plate, a metallic case, and a printed wiring board.

The device is provided with at least a housing containing a plurality of contacts, and the housing is at least partly formed of a material with good thermal conductivity. The plurality of contacts are linearly aligned at least in a row, and are in contact with at least a part of the housing through at least one of the insulating members formed of an electrically insulating material with high thermal conductivity.