To provide a crusher and an aggregate manufacturing device capable of stabilizing granularity after crushing and capable of at high rate obtaining crushed stones that can be used as aggregate such as concretes.

The crusher is provided with a crushed object injection port 3, crushing rollers 11 and 12 that each have a predetermined space at lower sections while mutually rotating reversely and a casing 21 at a further lower sections, an impact member 22 rotatably disposed at an almost central section of the casing and a reaction member 23, whose predetermined distance is being kept from the impact member and which is disposed at the periphery of the impact member is provided. The aggregate manufacturing device is provided with a tubby transfer section 91 that is disposed horizontally at a lower section of the crusher, a rotary shaft 92 that has an axial line longitudinally inside the transfer section, and a pressing member 94 and an obstruction member 95 that are provided in upright position on the rotational axis at an arbitrary distance and rotate inside the transfer section.