A comminuting device of biological material includes a casing that contains fixed cutting elements and movable cutting elements cooperating with each other to grind biological material, a collecting chamber for ground biological material, and a partition wall adjacent to the collecting chamber. The fixed and movable cutting elements are above the partition wall together with the biological material to be ground. The collecting chamber is below the partition wall. The fixed cutting elements are in the form of elongated corners that extend radially. The movable cutting elements are in the form of elongated corners that extend radially. The partition wall is provided with wall portions. Calibrated holes are provided for the passage of biological material ground by the fixed cutting elements and the movable cutting elements. The collecting chamber is in connection with the outside of the casing through at least a channel.