To provide a printing apparatus capable of sufficiently developing the advantage of a multistage developing system and capable of realizing optimization from a viewpoint of a developing function, the number of parts or the like in the relation with miniaturization arranging a plurality of developing devices with respect to one plate drum.

The developing devices 16A and 16B have two form rollers 26 and 28 and one ink supply roller 30 coming into contact with those rollers in common. The developing devices 16A and 16B are provided almost symmetrically with respect to the center of the plate drum 13, and form rollers 26A and 28A, an ink supply roller 30A, form rollers 26B and 28B and an ink supply roller 30B are almost symmetrically arranged but the rotary directions of them are same. Further, ink fountain parts 32A and 32B, blades 34A and 34B and skirt members 36A and 36B are arranged in the same way without having symmetry so that functions become same between the developing devices 16A and 16B.