An in-liquid turn bar disposed in a developing tank is set to discharge developer from plural slit-shaped discharge openings of a first cylindrical member such that a discharge rate of the developer per 1 m of the photosensitive material turning member is from 50 to 200 l/min (litter/minute). Regulating plates protruding from a surface of the first cylindrical member are provided at both transverse ends of the first cylindrical member. The amount of the developer discharged from both transverse ends of a photosensitive web is controlled by the regulating plates, thereby adjusting a gap between the first cylindrical member and the photosensitive web. Accordingly, the gap between the photosensitive web and the in-liquid turn bar is substantially uniform in a transverse direction, and thus the photosensitive web is turned without contact with the in-liquid turn bar.