To improve construction efficiency by overlapping the end parts of steel pipes of different diameters into a concentric circle shape, and filling concrete or the like in to an overlapped annular clearance.

Large diameter steel pipes 1 and small diameter steel pipes 2 are alternately inserted in a shaft 4, and the end part of the pipe 2 is inserted in the pipe 1 so as to be overlapped in concentric circle shape. Solidifying material 3 is filled in an annular clearance of the overlapped part, and if necessary, the solidifying material 3 is filled in the pipes 1, 2 at the same time to construct a pipe body 10. At this time, a locking member formed by bending the upper and lower end parts of a steel bar or the like into hook shape is locked between the end parts of the pipes 1, 2 to hold the pipes 1, 2 in a specified state. Or a bag body is fitted to the outer peripheral surface of a connection part of the pipe 2, and after insert-fitting the end part of the pipe 1, solidifying material is filled in the bag body to expand it, and the bag body is brought into close contact with the inner periphery of the pipe 1 to connect the pipes 1, 2. Jointing by welding is therefore dispensed with so as to improve work efficiency, and the pile body can be constructed without needing high pipe and accuracy required at the time of welding.