To provide a concrete hopper for a secondary product with which even a concrete having low fluidity can be supplied uniformly when a cylindrical formwork for secondary product is to be filled with the concrete and both end corners of the formwork can be also filled with the concrete smoothly.

In a storing section 5 of a concrete hopper 4, a stirrer 9 having a plurality of bar-like bodies 8 arranged near a circumferential part of a disk 7 is rotatably attached. A concrete is injected into a formwork in such a manner that the concrete is unraveled by the stirrer 9. In a discharging chute 6 at the lower part of the hopper, a flow passage changing damper 11 is arranged rotatably. When both end corners of the formwork are to be filled with the concrete, the flow passage changing damper 11 is tilted to the corners and the concrete is injected into the corners.