PURPOSE: To provide a viscous substance adhesion preventing structure of a belt support roller in a novel belt type continuous vacuum drying equipment where the belt is not meandered or damaged by reducing the amount of the viscous substance adhering to the belt support roller, and removing the viscous substance even when it is adhered.

CONSTITUTION: A belt support roller 20 to support a belt return part of a belt conveyor in a belt type continuous vacuum drying equipment is provided with projections 23 of the same height which are formed continuous and spiral toward one end or both ends of a roller body 21 by coiling the wire 22 over the circumferential surface of the roller body 21 having an extension part where one end or both ends are extended from the belt. The non-viscous adhesion preventing film 24 consisting of the fluororesin base material is provided so as to cover the surface of this roller body 21.