PURPOSE: To discharge a print sheet without making dirty a printed surface by supplying the sheet between a pair of rotatable plate cylinders opposed to each other, and engaging sheet discharge grippers provided at the cylinders with the side edge of the non-image forming area of the printed sheet.

CONSTITUTION: The sheet discharge unit for a stencil printer comprises upper master locking means 90, lower master locking means 140, upper ink supply means 100 and lower ink supply means 150 at each of a pair of upper and lower plate cylinders 1, 51 supported oppositely to the parts of outer peripheries. Further, the unit also comprises two plate cylinder support means for separably supporting the one cylinder to the other cylinder. Rockable sheet discharge pawls 21a, 21b and lower sheet discharge pawls 23a, 23b are engaged with the side edges of the non-image forming area of the printed sheet Pa on the outer periphery of the cylinder 51, and the sheet Pa is held by upper and lower pressing rollers 17a, 17b and 19a, 19b to be rotated, and conveyed to the downstream side of the conveying direction X.