Abstract: Lateral sealing device for doctor blade inking chambers of inking rolls for flexographic rotary printing machines, of the type comprising a rigid cassette housing a sealing element. The said sealing element is made in the form of a hollow body made from rubber or from elastomeric material having a consistency similar to that of rubber, closed on five sides and open on the side facing the end of the inking chamber, the side facing the inking roll being shaped in such a way as to have a curvature equal to that of the said roll, and provided with sides inclined in a way corresponding to the inclination of the scraper blades, an elastic element being housed inside the said hollow body and constantly pressing, with a substantially constant force, the side of the said hollow body interacting with the inking roll against the periphery of the inking roll.