To provide a pipe working apparatus with which a bulged part or a grooved part is formed on a pipe by simple constitution.

A driving and forming part 3 which is rotated with a driving rotary shaft 2 connecting to a driving means is installed on a supporting body 1. A driven forming part 5 provided with a pressing mechanism 14 which becomes a pressing means is installed. The pipe to be worked is inserted into the driving and forming part 3 and the driving forming part 3 is rotated by a driving means. The bulged part or the grooved part is formed on the pipe by pressing the driven forming part 5 against the driving forming part 3 by the pressing mechanism 14.