PURPOSE: To provide a means for performing pipe inner face deburring work important as the preparation work or the like before applying resin treatment to the inner face of even a pipe of large curvature.

CONSTITUTION: In this pipe inner face deburring machine, a ball broach 3 of diameter approximately equal to the inner diameter of a pipe 1 is provided with numerous cutting edges disposed almost all over the spherical face, and this ball broach 3 is passed through inside the pipe 1 to perform deburring.