PURPOSE: To enhance reliability and durability and to achieve lower cost and better productivity by preventing dislocation of a printed circuit board and breakage of the lead wires.

CONSTITUTION: A middle part of L shaped pins 3 is attached to a board attaching part 2 of a coil bobbin 1. A first pin part 3x... and a second pin part 3y... are provided, and the first pin part 3x... is inserted into a hole Eh of a printed circuit board E and connected with a pattern Ep of the printed circuit board E, and a lead wire Cw of a coil C is connected with the second pin part 3y.... Stopper parts 4, that are formed integrally with the board attaching part 2, engage the edge parts Ex and Ey of the printed circuit board E and fixes the printed circuit board E in the longitudinal direction of at least the first pin part 3x....