To provide a grating device capable of continuous grating treatment with a compact structure.

This grating device comprises a material input port 2c at an upper portion and a sieving hole at a lower portion for passing grated material of a specified grain size therethrough, and is provided with a hollow reservoir 2 for reserving the inputted material to be grated, multiple grating cutting edges 1 supported by a rotation shaft 11 provided in the reservoir 2 and moving along the inner surface of the reservoir 2, and a drive motor 3 for rotating the rotation shaft 11.