To enhance thermal efficiency in a drying furnace and improve a dried quality by reducing the dimensions of the entire coating facilities through miniaturizing the drying furnace and at the same time, inhibiting a heat leakage from the drying furnace, when coating and drying a long-size work.

A drying furnace 3 for drying a coat applied to a work W is installed in the back stage of a coating chamber in which a coating machine for coating the work W is provided. In addition, the work W is carried straight in its longitudinal direction by an overhead conveyor C1 for coating from the coating chamber to the drying furnace 3 and by an overhead conveyor C2 from the drying furnace 3 to a following step. The drying furnace 3 has a high temperature area 5 for drying the work W formed at the upper stages of a carrying-in aperture 4in and a carrying-out aperture 4out. The work W conveyed upto the drying furnace 3 is switched to a lift conveyor 7 and is made to ascend/ descend perpendicularly with the longitudinal direction of the work W maintained horizontally. Thus these works W are transferred in parallel to each other vertically in the high temperature area 5.