A mill, comprising: a grinding chamber; a rotating shaft located in the grinding chamber; a rotating body structured to have a disk-shaped rotary member fixed to the rotating shaft; and a casing provided to form an outer shell of the grinding chamber, and, an outlet arranged to discharge a solid-gas two-phase flow containing the particles and gas from the grinding chamber, wherein the grinding chamber communicates with the outlet on the downstream side of the chamber, wherein a cylindrical frame member having an inner peripheral surface formed in a corrugated shape along a circumferential direction is arranged coaxially with the rotating shaft in the casing, wherein the corrugated shape has a pitch that is greater than an amplitude, the rotary member has a ring-shaped circular member which includes a plurality of support plates arranged circularly and protruded in a radial direction from a circular disc, circular plates (43b, 43c) linked by the support plates, suction force is generated at the outlet by a function of the blower and a solid-gas two-phase flow of particles and a gas supplied to the grinding chamber is introduced through a gap between the casing and the rotating body into the grinding chamber, goes upward with being circled by the rotation energy of the rotating body that is rotated and driven by the motor in the grinding chamber while being accelerated by the rotating body, is repeatedly compressed and expanded along circumferential direction, and is collided against the inner peripheral surface and the circular member to grind or pulverize the particles, and ground particles reach the upper portion of the grinding chamber to be discharged from the outlet. a grinding chamber; a rotating shaft located in the grinding chamber; a rotating body structured to have a disk-shaped rotary member fixed to the rotating shaft; and a casing provided to form an outer shell of the grinding chamber, and, an outlet arranged to discharge a solid-gas two-phase flow containing the particles and gas from the grinding chamber, wherein the grinding chamber communicates with the outlet on the downstream side of the chamber, wherein a cylindrical frame member having an inner peripheral surface formed in a corrugated shape along a circumferential direction is arranged coaxially with the rotating shaft in the casing, wherein the corrugated shape has a pitch that is greater than an amplitude, the rotary member has a ring-shaped circular member which includes a plurality of support plates arranged circularly and protruded in a radial direction from a circular disc, circular plates (43b, 43c) linked by the support plates, suction force is generated at the outlet by a function of the blower and a solid-gas two-phase flow of particles and a gas supplied to the grinding chamber is introduced through a gap between the casing and the rotating body into the grinding chamber, goes upward with being circled by the rotation energy of the rotating body that is rotated and driven by the motor in the grinding chamber while being accelerated by the rotating body, is repeatedly compressed and expanded along circumferential direction, and is collided against the inner peripheral surface and the circular member to grind or pulverize the particles, and ground particles reach the upper portion of the grinding chamber to be discharged from the outlet.