A powder treating apparatus comprising: a rotating container into which plural kinds of powders having different specific gravities or sizes are supplied and which rotates in a predetermined direction; a fixed container retaining the rotating container at a center; primary treating means which is so arranged as to face an inner periphery surface of the rotating container and to extend in an axial direction, generates turbulence flow including eddying flow together with a rotational motion of the rotating container, and stirs and mixes the powders having different specific gravities or sizes; a communicating hole provided at a side face of a lower part of the rotating container for ejecting the powders stirred and mixed by the primary treating means to a predetermined treatment space around the rotating container; and secondary treating means which is formed integrally with the rotating container, applies planar compressive shear force to the powders ejected from the communicating hole with an inner periphery surface of the fixed container to carry out a composite treatment, and causes the powders having undergone a composite treatment to flow back in the rotating container and wherein the secondary treatment means comprises: a plurality of compressive shear members each protruding toward the fixed container from a bottom of an outer periphery surface of the rotating container, and having an opposing surface formed in a shape along a corresponding inner periphery surface of the fixed container with a predetermined clearance from the fixed container, the plurality of compressive shear members being arranged in a circumferential direction with a predetermined interval; and a plurality of upward flow generating members each formed between adjoining compressive shear members, and generating an upward flow of causing the powders ejected from the communicating hole to flow back in the rotating container, and each of the upward flow generating members is an inclined groove formed between adjoining compressive shear members and inclined toward an upstream side of a rotational direction from a bottom of the compressive shear member to a top of the compressive shear member. a rotating container into which plural kinds of powders having different specific gravities or sizes are supplied and which rotates in a predetermined direction; a fixed container retaining the rotating container at a center; primary treating means which is so arranged as to face an inner periphery surface of the rotating container and to extend in an axial direction, generates turbulence flow including eddying flow together with a rotational motion of the rotating container, and stirs and mixes the powders having different specific gravities or sizes; a communicating hole provided at a side face of a lower part of the rotating container for ejecting the powders stirred and mixed by the primary treating means to a predetermined treatment space around the rotating container; and secondary treating means which is formed integrally with the rotating container, applies planar compressive shear force to the powders ejected from the communicating hole with an inner periphery surface of the fixed container to carry out a composite treatment, and causes the powders having undergone a composite treatment to flow back in the rotating container and wherein a plurality of compressive shear members each protruding toward the fixed container from a bottom of an outer periphery surface of the rotating container, and having an opposing surface formed in a shape along a corresponding inner periphery surface of the fixed container with a predetermined clearance from the fixed container, the plurality of compressive shear members being arranged in a circumferential direction with a predetermined interval; and a plurality of upward flow generating members each formed between adjoining compressive shear members, and generating an upward flow of causing the powders ejected from the communicating hole to flow back in the rotating container, and each of the upward flow generating members is an inclined groove formed between adjoining compressive shear members and inclined toward an upstream side of a rotational direction from a bottom of the compressive shear member to a top of the compressive shear member.