To bring a crusher to a site by mounting it on a truck or the like to set it therein and to carry it out of the site after use by mounting it on the truck.

A machine frame 1 is divided into at least upper and lower stages and an upper machine frame 1a is separated from a lower machine frame 1b so as to be detachably mounted on the frame 1b. A pair of crushing teeth 3a, 3b and a pair of crushing teeth 4a, 4b and hoppers 2a, 2b are incorporated into the frames 1a, 1b, respectively, so that the frames 1a, 1b can be separately transported as a unit. A crushing mechanism for crushing blocks supplied is unitized in each of the upper and lower stages and further the unitized frame of the upper stage can be separated from the lower stage so that the frames 1a, 1b can be separately transported; therefore, when a crusher is brought into a site and carried out of the site after use, the frame of the unitized upper stage is taken out to dismount the crusher as a unit so that the crusher is mounted on a truck to carry it into a site for assembling.