PURPOSE: To obtain a welding robot which is capable of increasing a function without exceeding allowable torque of a rotating shaft, by constituting a titled robot so that plural welding guns are fitted to the same shaft of the tip of a movable part.

CONSTITUTION: In a robot having an arm 14 which is combined with a slider 12, a column 13, etc. on a base 11 and is fitted so as to be capable of performing a linear motion in three-dimensions 1W3, an L-shaped bracket 17 is fitted to this arm 14, jig driving parts 18, 19 are provided on its tip at a prescribed distance separated from each other, and a spot welding gun 16 of an X type and a spot welding gun 16a of a C type are installed through rotating shafts 6, 7, respectively. When executing a spot welding work of a work W of a car body, spot welding of a desired part is executed by executing position control of the welding gun 16 or 16a as desired, and by use of a welding robot of a 4-spindle function, a work close to a 5-spindle function can be executed.