PURPOSE: To eliminate conventional terminal pins and enable automatic fitting, by inserting a lamp holder into an insertion hole of a lamp base board and clamp the leading wire drawn out of the holder in the conductor formed between the external wall of holder and the internal wall of insertion hole.

CONSTITUTION: A pachinko game (Japanese pinball game) machine is provided with various lamps 1 to be lighted and the holders 4 thereof are fitted to a lamp base board 5. In this case, the insertion holes 21 of holders 4 are bored in the lamp base board 5, and conductors 24a, 24b electrically connected to wire paths 23a, 23b on the surface of lamp base board 5 are formed on the internal wall 22 of insertion hole 21. When the holder 4 is inserted in the insertion hole 21, the leading wires 2 inserted in the pierced holes of holder 4 are bent along the external wall 26 of holder 4. In this way, the leading wires are clamped between the holder 4 and the internal wall 22 of inssertion hole and, hence, the leading wires are electrically connected to the conductors 24a, 24b.