PURPOSE: To obtain a drier for automatically early drying a work having a thermally weak part and fine gaps and to be associated with a line.

CONSTITUTION: A vacuum vessel 3 for forming a vacuum chamber 33 is separably divided into an upper block 30 and a lower block 31. An endless belt 10 of a belt conveyor 1 for conveying a work W is pressed in a state held between the upper and lower blocks are to contain the work in the chamber 33, and heating means 4 regulating a temperature distribution by a heater 42 and coolant 43 is mounted in the vacuum chamber.