An arc welding device is provided with: a power output means for supplying welding power; a wire feed means for feeding welding wire in a forward direction and a reverse direction; and a control means for controlling the power output means and the wire feed means. During welding, a plurality of unit welding steps is performed repeatedly. Each unit welding step has a shorting step wherein the welding wire is shorted with base material and an arc step for generating an arc between the welding wire and the base material. When a period from the start of the arc step to reaching the maximum forward feed rate for the feed rate of the wire is called a transition period and the average value for the welding current in the shorting step and the arc step is called the average welding current, the control means sets a current suppression period, wherein the welding current becomes a value smaller than the average welding current, within the transition period. Letting T0 be the length of the transition period and T1 the
