PURPOSE: To conduct positive connection without damaging a conductor pattern in another pattern layer, and to improve reliability by forming a pattern layer with a pattern terminal for spot welding and another pattern layer, to which the conductor pattern is shaped, avoiding superposition to the pattern terminal for spot welding.

CONSTITUTION: A board material 1 has a conductor pattern 3, including pattern terminals 2a, 2b for spot welding, shaped in a copper material layer onto the and other conductor patterns 4 on the surface, avoiding superposition to the pattern terminals 2a, 2b on the rear. A thin type battery 5 is arranged at a specified relative position to a multilayer board 10 in order to mount the thin type battery 5 on the multilayer board 10, battery electrodes 6a, 6b are oppositely contacted respectively with the pattern terminals 2a, 2b, and laser beams 7 are applied from the battery electrode 6a, 6b sides. The wiring patterns 4 as other pattern layers are shaped, averting superposition to the pattern terminals 2a, 2b at that time, thus preventing damage, cutting, etc., of the wiring pattern 4, etc.