To provide a barrel type drying machine which achieves power saving, space saving, manpower saving, and speeding up of a treatment process, by drying a small component of which the surface has been treated with plating or the like in the barrel and washed in the water, without taking it out once from the barrel.

This drying machine is characterized by having a barrel 2 which is manufactured from a plastic material for bearing 100°C with molding or machining, so as to have a taper 16 on a slit slot 14 for letting air pass through, attaching a rotation mechanism 27 for rotating the barrel 2 slowly, outside of a drying tank 39, and providing a register 40 and a register 41 for passing hot-air mainly to the barrel 2 at high speed in one way in the drying tank 39.