To reduce the size and cost by securing lead wires to a printed wiring board to be soldered with the terminal pins of a motor while covering the lead-out part with a heat absorbing tube.

Terminal pins 13, 14 connected with coil windings 11, 12 for four phases are soldered at the holes of a printed wiring board 16 while penetrating a terminal cover 15. The printed wiring board 16 and lead wires 17 are secured by means of a heat absorbing tube 20a. The printed wiring board 16 is soldered with a lead-out part an covered with the heat absorbing tube 20a which is then heated to secure the printed wiring board 16 and the lead wires 17. When the soldered part of the lead wires 17 is insulated and the printed wiring board 16 is secured along with the lead-out part, the lead wire 17 can be protected against stripping or breakage due to repetitive application of load.