To provide a regeneration type plate making on press/printing apparatus.

The regeneration type plate making on press/printing apparatus is mainly constituted of a planographic printer which has a plate cylinder (21), a blanket cylinder (22), an impression cylinder (23), an inking arrangement (6) and a dampening arrangement (7), a support fixing means (31) for fixing a support (3) on the plate cylinder (21), a plate agent supply mechanism (4) for supplying a plate agent to the support (3), an exposure mechanism (5) for imagewise exposing the photosensitive planographic printing plate formed by supplying and applying a photosensitive plate agent to the support (3), a plate agent removing mechanism comprising predetermined elements, a slidable front opening type casing (1) for housing the whole of the respective elements, and a dust removing filter (11) arranged to the ceiling of the casing (1).