PURPOSE: To provide a band material dryer in which a drying efficiency is enhanced by suppressing the dissipation of heat from a part in which a band material is not wound in the dryer of a heating cylinder to be heated therein in which the material to be dried is partly wound.
CONSTITUTION: A circular-arclike heat insulation cover 4 having heat insulation in the state for covering the outer peripheral exposed part 1b of a heating cylinder 1 is detachably fixed to a frame. The peripheral edge of the surface of the cover 4 opposed to the part 1b is sealed by sealing means 7, 8, etc., and a gap (d) between the part 1b and the cover 4 is formed as an outer peripheral surface heat insulating chamber 9. Heating means 20 is provided at the cover 4 as required to positively heat the part 1b and the chamber 9.