PURPOSE: To uniformize the contact pressure and to form a coating film having uniform thickness by parallelly and parallelly and horizontally supporting the cylindrical material to be coated and endless transfer belt which can be relatively approached to and separated from each other.

CONSTITUTION: A pickup roll 5 and the transfer belt 4 are rotated in the same direction, and the uniform film of a paint is formed on the surface of the belt 4. Under such conditions, a cylindrical material W such as the piston of an internal combustion engine is lowered from above the belt 4 while being rotated, and brought into contact with the belt 4 to the extent that the belt 4 is slightly bent. When the material W makes one revolution by contact with the belt 4, the material W is again raised and separated from the belt 4 while being rotated. As a result, the utilizing efficiency is increased, and a coating film having uniform thickness can be formed without masking a recess, etc.