A consumable electrode gas shield arc welding torch (20) includes a torch body (21), a tip body (22) mounted to a front end of the torch body, a tip holder (23) mounted to a front end of the tip body, a spring (26) provided in the tip body (22) in contact with the front end of the torch body (21), a pressing shaft (27) provided in the tip body (22) in contact with a front end of the spring 26) and a power feed tip (28) pressed by the pressing shaft (27) and the tip holder (23). The tip (28) includes a side surface having a projection contacting with a base end (23a) of the holder (23), with a space (29) defined between an inner surface of the holder (23) and a front end (28a) of the tip (28) when the front end (28a) of the tip (28) is inserted into the holder (23).