To provide a developing apparatus capable of suppressing the progress of inappropriate processing of a photosensitive material pulled up from the liquid level of a processing tank and carrying out appropriate processing.

A conveying path for conveying the printing paper P pulled up from the liquid level of the processing tank to the next processing tank by a crossover rack 35 is formed, and the apparatus includes a nozzle N for injecting wash water to the printing paper P conveyed on the conveying path. The processing liquid sticking on the photosensitive surface of the printing paper P is washed away by the wash water injected from the nozzle N, and simultaneously, a water film is formed on the photosensitive surface. Consequently, such a failure is prevented that the processing liquid acts the printing paper P in such a situation that the processing liquid is oxidized by the air.