To effectively drying treat a material to be treated by operating various type modes such as a drive in combination of a centrifugal rotary operation and a hot air circulating operation, a drive in combination of a vibration smoothing operation and the circulating operation, a drive in combination of the centrifugal operation, the smoothing operation and the circulating operation or the like.

A cage receiving container 16 is provided at an upper end of a rotary cylinder 13 driven by a centrifugal rotary motor 28, a treating cage containing a material to be treated is placed in the container 16, and a centrifugal rotary means for rotating the cage together with the container 16 through the cylinder 13 by driving the motor 28, a vibration smoothing means for giving a mechanical vibration in a vertical direction to the cage when the centrifugal rotation by the rotary means is paused, and a hot air circulating means arranging the cage in the circulating passage to blow a hot air to a material to be treated in the cage are provided.