To provide a drying device for a battery coater for use with a negative electrode wherein wear powder generation at the time of attaching/ detaching a drier nozzle is prevented and attaching/detaching operation is easy.

In a drying device for a battery coater for use with a negative electrode wherein a drier nozzle is mounted detachably on a nozzle mounting part by an extracting operation crossing the moving direction of copper foil and the copper foil is dried by hot air blown out from the drier nozzle, a lock part composed of a rod-like projection and a recessed part 33 for locking the drier nozzle on the nozzle mounting part 23 so as to be able to make turning motion by a push-in operation in the reverse direction of the extraction direction is provided on a rear end in the extraction direction of the drier nozzle 21, and a releasable holding part composed of a receiving metallic part 29 and a hitching metallic part 36 for sticking the drier nozzle 21 fast to, and for holding it on, the nozzle mounting part 23 is provided on a front end in the extraction direction of the drier nozzle 21.