To provide a pipe purging tool capable of purging a pipe regardless of a long pipe, a complicatedly curved drainage pipe, and the shape and constitution of a clogging matter, easily usable even by a person of a general household who is not specialist, and a pipe purging method using this tool.

A pipe purging tool comprises a shell 2 inserted into an opening 17 of a drainage pipe 16 and a liquid guiding pipe 13 connected to an end portion of the shell 2. A liquid jetting hole 10 is formed to penetrate a tip portion of the shell 2, and a liquid passing hole 11 is formed to penetrate an outer peripheral surface of the shell 2. A rubber cylindrical body 9 is disposed on the outer side of the outer peripheral surface of the shell 2, and an air-tight bag part 22 is formed between the outer peripheral surface of the shell 2 and the rubber cylindrical body 9. A pressure liquid guided from the liquid guiding pipe 13 into the shell 2 enters the air-tight bag part 22 through the liquid passing hole 11, and thereby the rubber cylindrical body 9 is elastically deformed and expanded outward in the radial direction of the shell 2 so as to closely contact an inner peripheral surface 16A of the drainage pipe 16.