To transmit a load to an original ground from an H-type steel portion provided at the tip of the ready-made pile without generating a large amount of excavated slurry, thereby increasing the vertical load bearable by one pile.

An excavated bore hole is made through a pile main body portion and an enlarged bottom portion. Within the excavated bore hole, a ready-made pile having an H type steel with a projected portion or reinforced rib at the tip is lowered and the bore hole is filled with cement milk. After the solidification of the cement milk, a ready-made pile is dropped in the enlarged bottom portion of the H-type steel portion. The H-type steel portion is arranged inside the enlarged portion of the excavated bore hole. When a vertical load acts to the ready-made pile, the load is transmitted at the peripheral edge of the H-type steel of the ready-made pile.