An inclined type kicker for pushing out a lowermost-layer corrugated cardboard sheet in a plurality of corrugated cardboard sheets stacked in a hopper toward a front gate disposed on the downstream side of a sheet transferring direction in the hopper includes: a push-out face for pushing out the lowermost-layer corrugated cardboard sheet toward a lower end opening side of the front gate in abutment against a rear end of the lowermost-layer corrugated cardboard sheet on the upstream side of the sheet transferring direction; and a rear end lift-up face which is obliquely formed such that the height is gradually increased toward the upstream side of the sheet transferring direction and adapted to lift upward the rear end side of the corrugated cardboard sheet located on the upper layer side of the lowermost-layer corrugated cardboard sheet with an operation of pushing out the lowermost-layer corrugated cardboard sheet.