Abstract: The present invention relates to a TIG welding machine. The TIG welding machine according to the present invention includes: a torch unit (400) disposed with an electrode (632), a wire (634) and a weaving unit (410); a welding posture control unit (100) for controlling a welding posture by rotating the torch unit (400) vertically and horizontally so as to precede the torch unit (400) with reference to the advancing direction of the torch unit (400); a weld line tracing unit (200) mounted to the welding posture control unit (100) and detecting the placed state of a base metal for welding so as to trace a weld line; and a torch transfer unit (300) for moving the torch unit (400) based on the information of the weld line which has been traced in the weld line tracing unit (200).