To provide a cylinder dryer causing no accumulation of condensate on a cylinder inner wall surface, even when used for a long period of time.

A steam supply pipe 2 is connected to a cylinder 1 via a rotary joint 5. In the same manner, a condensate discharge pipe 3 is connected via a rotary joint 9. One part of a steam supply pipe 6 in the cylinder 1 is branched off and a steam ejector 4 is connected. The opening 11 of a suction part 10 of the steam ejector 4 is disposed via a slight gap with the inner wall surface of the cylinder 1. Condensate generated in the cylinder 1 is sucked by the steam ejector 4 from the opening 11 of the steam ejector 4, and furthermore, it is discharged to the outside through the condensate discharge pipe 3.