To prevent an arc discharge by restraining the vibration of a welding wire at the time of welding with a large quantity of current and eliminating the contact defect between the welding wire and a contact tip.

The contact tip holder 4, incorporated the contact tip 3 electrically energizing the welding wire 5 into the tip end part of a passage, is installed to the tip end of a wire guide 2. The inner guide sleeve 6 inserting the welding wire 5 and the cushion rubber spacer 7 made of non-rebound rubber elastically supporting the inner guide sleeve 6 are arranged in the passage 4a within the contact tip holder 4 existing in the upstream part more than the contact tip 3.