A housing (10) used for an electric part, includes a wire section (32) electrically connected to an electric circuit (20) including an electric component (22), and a housing body (31) composed of resin, characterized in that the wire section (32) includes a first terminal part (321) exposed at a surface of the housing body (31), a second terminal part (324) exposed at a surface of the housing body (31), and a thermally conductive part (322) formed between the first terminal part (321) and the second terminal part (324), and embedded in the housing body (31), the thermally conductive part (322) has a width greater than the same of the first and second terminal parts (321, 324).