To provide the pipe fixing structure and the pipe fixing method that can get more fixing power than a certain level by the simple structure.

In the pipe fixing structure to fix a pipe 2 by deforming it by applying the power to press the pipe 2 axially against the ejector 1 that the pipe 2 is fixed, the pipe 2 can be inserted axially into an ejector 1 and an enlarged-diameter part 1a of larger diameter than the outside diameter is formed and a thin-walled part 2a is formed in the inner peripheral part of the pipe 2. It comprises the first protrusion part (6) to be made by plastic deforming a thin-walled part 2a of the pipe 2 with the press power and the pipe 2 is the pipe fixing structure to be fixed in the ejector 1 because this first protrusion part 6 adjusts to the enlarged-diameter part 1a.