To make it possible to efficiently crush waste concrete materials desired sizes and easily sort and remove foreign matter without overlooking as far as possible by crushing the waste concrete materials in a waste material crushing section and sorting and removing the foreign matter included in the crushed waste concrete materials in a sorting and removing section.

The waste concrete materials introduced into a hopper body 16 are crushed between a pair of moving rollers 13 and blades 21. The crushed materials are sorted and removed by the grooves of the blades 21 and blade 27b. Only the materials crushed to the prescribed size (a) or below among the crushed waste concrete materials are introduced between a pair of a turning roller 14 and a supporting body 15. The materials failing to pass this spacing are placed on a conveyor 22 and are led outside the main body. In succession, the waste concrete materials passed and introduced through this spacing are further crushed as to be collapsed and are sorted and removed by the grooves of the supporting body 1 and the spacing between a window 15a and a turning cylinder 15b. Only the materials crushed to the specified size (b) or below are placed on a conveyor 2 and are led outside the main body.