To provide a construction method of a cast-in-place pile that can carry out previous boring and pile driving in one step and carry out construction even with obstacles such as boulder stones.

This construction method of the cast-in-place pile comprises removing soil while forming an excavated hole 2 in the ground 1 with a casing pipe 52 provided with an outer bit 51 at the tip, an inner rod 62 provided with an inner bit 61 at the tip, and boring water W, inserting the casing pipe 52 into the ground 1, pulling out the inner rod 62 in the state of the casing pipe 52 remaining in the excavated hole 2 after forming the excavated hole 2, injecting a predetermined amount of solidifying filler 3 into the casing pipe 52 from an injection pipe 7, and then pulling out the casing pipe 52 by the approximately same section as the injected section of the solidifying filler 3 to replace the soil in the ground 1 with the solidifying filler.