Stencil printer having ink leakage preventing construction

A stencil printer comprising a printing drum having a perforated construction at a circumferential portion thereof except two annular edge portions extending along opposite axial ends of a cylindrical configuration thereof and a strip of stencil sheet leading end mounting portion extending between said two annular edge portions along a generatrix of the cylindrical configuration, an inking roller provided inside of said printing drum so as to supply ink to said perforated circumferential portion of said printing drum from the inside thereof, and a back press roller having a clamp for mounting a leading end of a print sheet thereto provided along a generatrix thereof, said printing drum and said back press roller being arranged in proximity and parallel to one another and adapted to rotate in directions opposite to one another so as to execute a stencil printing such that the ink supplied to said perforated portion of said printing drum by said inking roller is selectively transferred through a stencil sheet mounted around said printing drum to provide a printed image of ink on a print sheet supplied between said printing drum and said back press roller with a leading end portion thereof being held by said clamp, wherein the stencil printer further comprises a strip of elastic sheet mounted on said back press roller along a generatrix thereof so as to cover said clamp.