To attain stable rotation of a rotary drum by preventing the occurrence of damage in both a tire and the rotary drum.

This horizontal rotary dryer has the rotary drum 10 freely rotatable around the axial direction, and dries a drying object in the rotary drum by drying external heat while rotating the rotary drum 10. The tire 14 is fitted and fixed by shrinkage fitting around the rotary drum 10 via a plurality of shims 15 arranged and fixed at an interval in the circumferential direction. The tire 14 is regulated on a movement by thrust directional movement regulating means 15A and 16.