To provide a conventional method for scattering sediment on soft ground constituted by very simple light-weight equipment to reduce facility cost without causing pollution and being safe for a worker engaged in the work.

In a scattering device 1 constituted by a plurality of belt conveyors 3, 4, 5, 6 arranged by connecting continuously from a fixed amount discharge hopper 2 and a lower part opening of the fixed amount discharge hopper 2, sediment 24, 25 supplied into the fixed amount discharge hopper 2 is sequentially conveyed to a tip of the scattering device 1 and is scattered like circular arc from a front end fringe turning in the left and right directions around a rear end part in the tip belt conveyor 6 of the scattering device 1.