원래 이름 기록: OKAYAMA UNIVERSITY; KATAOKA CORPORATION

A laser welding device includes a support that supports a base material, an irradiation unit that irradiates the base material with a laser beam, and a drive mechanism that moves the irradiation unit relative to the base material to scan the laser beam, and the drive mechanism moves the laser beam relative to the base material in a posture in which an optical axis of the laser beam is tilted backward with respect to a scanning direction.