To obtain the subject hot air tank that enables smooth feather-picking operation as the temperature of the hot water on the picking is suppressed lower as much as possible and arranging a far-infrared emitter on the inside.

A far-infrared emitter 3 is arranged inside the hot water tank 1. The tank in which a far-infrared emitter 3 is arranged is filled with hot water in which a poultry to be picked is dipped for a certain time, then the poultry is picked by means of a picker. The far-infrared emitter 3 is a substance that can largely emit far-infrared rays, for example, a disk made from a mixture of 30 wt.% of potassium titanate and 70 wt.% of an ABS resin as a binder.