A laser welding tool including a welding head, a welding tip mounted to the welding head, a guide pin disposed so as to be spaced apart from the welding tip, a support device that supports the welding head and the guide pin, and a floating apparatus connected to the support device and configured to allow the welding head and the guide pin on the support device move in a floating state, relative to the floating apparatus, along an up-and-down direction and along a right-and-left direction while the guide pin is in a state of contacting a welding target portion during welding.