Abstract: A waste substance is crushed and separated into a crushed waste metallic substance and a crushed waste non-metallic substance by the crushing in the fine adjustment in mm unit and striking by hammers, and then discharged out of a shredder through box-shaped spaces having an inclined plane of an inclined upper shredder damper rocking by the fine adjustment in mm unit of the shredder. Thereby the waste substance is crushed and separated securely and efficiently, and the crushed waste metallic substance in 2-5 mm unit and the crushed waste non-metallic substance can be manufactured in the state that they are valuable as articles of commerce and can be effectively utilized as resources. When the crushed waste metallic substance is supplied to a furnace, the melting speed can be improved and the fuel cost necessary for the melting can be saved. Also the invention contributes to prevention of abuses such as environmental pollution by soot and smoke and the contamination of the atmosphere.