To provide a coating method and a coating device capable of forming a thin coating film of uniform film thickness, and a high speed coating, not depending on the planarity of the substrate even in a high viscosity solution.

In an extrusion coating method which simultaneously can form two or more coating layers on a belt-like substrate continuously carried from the upstream to the downstream, while the opposite surface of the coating is kept with a back-roll, the method is characterized by lowering the innermost layer viscosity than that of the adjacent layer.