<p>An arc welding robot in which vibration of an arm is suppressed without impairing durability of a conduit cable and with a merit of conventional industrial robots where no interference occurs maintained. A reinforcement member (10) formed by smoothly curving a plate-like material and having a U-shaped cross-section is attached to a rotating shaft (fourth axis) of a first arm (3) with the recess side of the U shape facing the rotating shaft.</p>
