PURPOSE: To prevent the camber of steel sheet with the pressure of a spot welding and to cause no defective adhering by spot-welding the peripheral part of the welding zone of a laminated steel sheet by press-pinching it with a press-pinching device simultaneously with welding the press-pinching part.

CONSTITUTION: Steel sheets 12, 14 are laminated by coating an adhesive 10 on one side hereof and the peripheral part of the tack welding zone 11 thereof is subjected to a spot welding with its press-pinching by pressure devices 15, 19. The camber of the steel sheets 12, 14 by the pressure of the spot welding can thus be prevented and they become in a adhesive state with the hardening of the peripheral adhesive 10 of heat hardening type by the heat of the spot welding as well and the press-pinched steel sheets 12, 14 is adhered by the adhesive 10. Due to the peripheral part of the welding zone 11 being adhered simultaneously at tack welding time no adhering defect is caused in case of adhering the steel sheets 12, 14 by a hot press at after stage.