Abstract: A cutting machine includes a machine body for holding a synthetic resin pipe subjected to cut work, a plate-like cutter provided on the machine body for advancing and retracting movement with respect to the pipe within a plane perpendicularly intersecting the center line of the pipe, and a drive means for the cutter provided on the machine body, the cutter being provided at its edge opposite to the pipe with an angled cutting blade having a width in a direction perpendicular to the advancing and retracting direction of the cutter larger than the outside diameter of the pipe, the blade portion displaced toward one side of an imaginary straight line which passes through a center of the pipe in parallel with the advancing and retracting direction of the cutter, a first inclined portion continuous to the edge portion and crossing the imaginary straight line, and a second inclined portion continuous to the edge portion on the side opposite to the first inclined portion and coming into contact with the inner periph