The present invention relates to a crusher for used metals that performs cutting and crushing for facilitating storage and reprocessing in order to recycle various types of used metals of large size such as discarded vehicles. The present invention includes a hopper that has the form of a container which has an open upper portion, guides inward used metal supply, and has a plurality of projections protruding from the inside surface thereof; a crushing unit made up of a rotary shaft that has a central portion rotatably fixed to a bottom surface of the hopper and an upper portion accommodated in the hopper, a plurality of discs fixed and separated from each other along a length direction of the rotary shaft, a plurality of cutters protruding from outer peripheral surfaces of the discs; a driving unit placed in a lower portion of the hopper, connected to a lower portion of the rotary shaft, and rotating the rotary shaft; and a frame accommodating the driving unit, wherein the hopper is mounted on the frame.
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