To prevent the lowering of the productivity and the attaching of varnish to the outside and inside peripheral surfaces of a case by dipping only the coil part being on time lower side of a stator into a varnish solution in a container and taking them out.

When a motor 14 is rotated in the forward direction, a threaded shaft 11 rotates in the forward direction through the medium of a transmitting shaft 12, and a bevel gear 13, and a container 5 is raised until only one coil part 32b exposed downwards is dipped into a varnish solution in the container 5. Consequently, the one coil part 32b exposed downwards from the case 31 of each stator 30 held inside a holding apparatus 20 is dipped into the varnish solution inside the container 5, and varnish adheres to the coil part 32b. Along with it, the varnish solution proceeds from the side of the coil part 32b touches the coil part 32 inside the case 31 by a capillary phenomenon, and the varnish solution adheres to this part too. After the passage of a specified time, the motor 14 is rotated in the reverse direction and the container 5 is caused to descend up to a set position, and the one coil part 32b exposed downwards is taken out from the varnish solution in the container 5.