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 ground 3 is excavated so as to have 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, thereafter an expansively drilled hole 4b is formed at the front end of a small-diameter drilled hole 4a, and filling a hardening material is filled into the expansively drilled hole 4b. Then hauling-up excavation is carried out over a predetermined distance from the expansively drilled hole 4b to the surface of the ground 3 such that the resultant hole has a diameter larger than the outer diameter of the spiral blade 5a. 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.