To provide an attrition mill which can reduce the number of parts and allows easy assembly and disassembly.

This attrition mill has an upper rotor 15 and a lower rotor 16 facing each other, limits the rotation of the upper rotor 15 and rotates the lower rotor 16. An annular receiving groove 35 for receiving pulverized powder tea is formed near the outer periphery of the front surface of the lower rotor 16. The upper rotor 15 is formed with a notch 36 in a position corresponding to the receiving groove 35 and is provided with a scraper 37 projecting into the receiving groove 35 so as to scrap the pulverized matter stagnating in the receiving groove 35 out of the receiving groove 35. The powder tea pulverized between the upper rotor 15 and the lower rotor 16 is centrifuged and is accumulated in the receiving groove 35. The powder tea accumulated in the receiving groove 35 is scrapped together by the scraper 37 disposed at the upper rotor 15 when the lower rotor 16 rotates.