A tracking welder, which is provided with a carriage traveling in the forward and backward direction, a welding torch mounted on the carriage, a weaving driver for weaving the welding torch, a tracking system for running the carriage along a predetermined welding line, and a welding torch holder for holding the welding torch through the weaving driver and holding the weaving driver adjustably so as to shift the weaving direction of the welding torch around the center of a weaving path. According to this welder, it is possible to carry out fillet welding without causing unbalance of deposit metal between sides on a carriage running face and a tracking face, not only in a case the welding is carried out on a nearly horizontal carriage running face and a nearly vertical carriage running face, but also even in a case the welding is carried out on an inclined carriage running face.
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