To prevent a tip part of a chain member from being turned around a connection part side.

A used paper packing device comprises a hopper for forming a space for stirring used paper inside thereof, a used paper feeding means for feeding used paper from an upper part in the hopper, a stirring means provided in the hopper, a compression chamber communicated with a bottom part of the hopper, a compressing means for compressing used paper stored in this compression chamber, and a binding means for binding the compressed used paper. The stirring means has a chain member comprising first and second metal ring pieces 311 and 312 connected to a rotary shaft. A stopper pin 36 for preventing the rotational movement of the ring piece 312 is provided on an intermediate part on the inner side of the second metal ring piece 31. This stopper pin 36 prevents a tip part with a blade member 32 fixed thereto from being turned around the connection part side to the first metal ring piece 311.