To provide a garbage disposal device which is capable of positively stirring garbage to be disposed of regardless of its quantity and securely and efficiently grinding even the hard garbage to be disposed of with a sufficient deodorizing function.

A plurality of cutter members 9 are fixed, in a radial direction, at the bottom part of a disposal chamber 2 and a lower rotary blade 8 which rotates centered around a vertical shaft 7, is installed below an overflow cylinder 4 supported upright in the disposal chamber 2. In addition, window holes 4w for passage of the garbage to be disposed of are opened in the side wall of the overflow cylinder 4 so that the overflow action is possible even when the quantity of the garbage is small. Further, vertical cutter members Lo and Li are fixed standing upright at the lower rotary blade 8 and thus the cutting function for bone and the like is provided between the cutter members Lo and Li and the side edges 4e of the window holes 4w.