To provide a drying treatment device for an organic treatment object capable of efficiently carrying out drying treatment of the treatment object such as organic waste including water contents in a state not generating odor.

The drying treatment device 10 for the organic treatment object has a holding body 12 provided in a sealed state to hold the organic treatment object in an interior, a steam jetting means 14 for jetting steam toward the treatment object P in the holding body 12, an agitating means 16 for agitating the treatment object, and an air jetting means 15 for jetting air toward the treatment object agitated by the agitating means while being jetted with steam. By this, the organic waste can be efficiently dried, odor components are removed from the waste, and odor generation from the waste after drying treatment can be prevented.