To provide a rotary embedding method for a pile by which the quantity of excavated waste soil is small, running torque generated in the rotary embedding of the pile is small, and the misalignment of the pile and a bend (clearance) are hardly generated.

By the rotary embedding method for the pile, the primary excavation of the ground 3 is carried out so as to form a hole having a diameter equal to or larger than the outer diameter of a pile 5 body and smaller than the outer diameter of a spiral blade 5a, and thereafter a secondary excavation step is repeatedly carried out at a predetermined location of the primarily drilled hole 4a so as to have a diameter larger than the outer diameter of the spiral blade 5a until the secondary excavation reaches a predetermined depth. Thereafter an expansively drilled hole 4b is formed at the front end of the drilled hole 4, and a hardening material is filled into the expansively drilled hole 4b. Further when the pile 5 is rotatively embedded in the drilled hole 4, the spiral blade 5a is settled in the expansively drilled hole 4b while soil discharged to the ground is back-filled into a pile hollow portion.