To provide a hollow body which can manufacture effective in the cost, and a manufacturing method of the hollow body.

In the manufacturing method of the hollow body and the hollow body, the hollow part enabling manufacture as a simple sheet material part contains a water guide 9 in the inner part. The water guide 9 can be formed by inserting the simple sheet material part onto the inner part of the hollow part at the outside and then, fitting to suitable position on the side surface of inside of the hollow body, and successively, welding. In further detail on the welding, the welding can perform under assistance of laser beam enabling the formation from the outside surface of the hollow body. In this result, the welded part can be formed to the position where can not perform with the other method.