Disclosed is an air supplying device for a welding mask, capable of supplying clean air into a face shield of the welding mask. According to an embodiment of the present invention, more specifically, the air supplying device comprises a housing connected to the face shield, a connection member connected to a supply port of the housing, a first opening/closing member connected to a first outlet part of the housing, and a second opening/closing member connected to a second outlet of the housing. Therefore, the air supplying device is capable of conveniently adjusting direction of a bellows hose connected to supply the air and also adjusting quantity and direction of the air being supplied.