Abstract: A granulating and coating apparatus comprising a rotary drum to be charged therein a powdery or granular material, and a baffle plate provided in the rotary drum and not rotatable together with the rotary drum. The rotary drum is formed to be a polygonal shape. This polygonal shape may be, for example, a pentagon, a hexagon, an octagon or a decagon. The baffle plate may be positionally fixedly supported. Or, the baffle plate can be made to change a position in a rocking direction, a position of the rotary drum in the axial direction, a depth of insertion into a layer of a powdery or granular material or an angle of insertion by use of plurality of actuators.