PURPOSE: To stabilize battery performance of a battery using the electrode, and improve productivity by always keeping to be constant an applying amount of battery material to an electrode base board.

CONSTITUTION: A slurry-like battery material vessel 1 and a slurry-like battery material stock tank 10 are connected, and a slit 5 is provided above the slurry- like battery material vessel 1. The slit 5 scrapes extra slurry-like battery material 2 out of both faces of long-size electrode base board 4 to which slurry-like battery material 2 is applied when the same passes inside the slurry-like battery material vessel 1. A sensor 7 measuring liquid level height of the slurry-like battery material vessel 1 is provide so that the slurry-like battery material 2 is fed from the slurry-like battery material stock tank 10 to the slurry-like battery material vessel 1 when the liquid level thereof becomes low or high against a setting value. Or, the feeding of the slurry-like battery material 2 to the slurry-like battery material vessel 1 is stopped, or reversely the slurry-like battery material 2 is fed from the slurry-like battery material vessel 1 to the slurry-like battery material stock tank 10.