To provide a particulate mixing apparatus for homogeneously mixing particulates having different particle sizes in an extremely short time by one cycle of treatment, sharply reducing a mixing time and homogeneously mixing a granular substance having a large particle size with another powdery substance having a small particle size while holding the original large particle size without being crushed even if the granular substance of a large particle size comprises an easily crushable soft component.

The particulate mixing apparatus has an impeller 6 which is formed by attaching vanes 8 having one or more through-holes 7 bored in the plate surfaces thereof to the periphery of a rotary shaft 9 in a waterwheel state, a drive means 11 for rotating the impeller and a particulate charging hopper 2 arranged above the impeller. Each of the vanes 8 comprise two types of vanes 81 and 82 of which the positions and sizes of the through-holes 7 are set so that the mutual through-holes 7 are not overlapped when two types of the vanes are superposed one upon another and a predetermined number of two types of the vanes are mutually attached alternately.