To provide a rear part feeding device for a horizontal slicer capable of mechanically and automatically executing the work for removing a remaining part of a meat block after cutting from a small presser claw in the rear part feeding device for a horizontal slicer.

The rear part feeding device 3 for a horizontal slicer is provided with a main presser claw 5, which is provided to the rear part of a meat box 2 and sticks the rear end part of the meat block from above, and the small presser claw 6 which faces the main presser claw and sticks the rear end part of the meat block from beneath. The device 3 is provided with a support plate 8 capable of ascending/descending, in which an insertion hole 7 is arranged along the array direction of the small presser claw and which comes into contact with the lower face of the rear end part of the meat block, and an air cylinder 11 which elevates the support plate to the height of almost dodging the tip of the small presser claw after the escapement of the main presser claw. The remaining part m of the meat block after cutting is automatically removed forward by elevating the support plate with the air cylinder.