To excellently weld the end part of a deep and narrow gap.

In a narrow gap welding equipment being inserted into a ditch shaped narrow gap (f) and welding the end of the narrow gap (f), a welding torch 3 lineally extending toward the end side of the narrow gap (f) from a carriage 2 is provided rotatably around the axis on the carriage 2 running along an inlet peripheral part (g) of the narrow gap (f), an electrode 12 in the end part of the welding torch 3 is bent, and further welding wire feeding means 4 feeding a welding wire Y are respectively to the left and right side of the carriage 2 in the advancing direction of the welding torch 3.