A terminal block has nuts (10), each with a step (12) slightly recessed and formed at an outer peripheral part of an upper fastening surface (10A) on which conductors are to be placed. A heat sink (40) is arranged below the nuts (10) and an insulating plate (20) is sandwiched between the nuts (10) and the heat sink (40). Resin (60) is molded around these three kinds of members (10, 20, 40). The steps (12) are pressed by resin cut-off parts (73) provided in a first mold (71) for the resin (60). Restricted surfaces (12A) at outer peripheral sides of press surfaces (12B) to be pressed by the resin cut-off parts (73) on the steps (12) are covered by the molded resin (60).