To provide a mill by which two kinds of materials to be milled can be accommodated and milled.

The mill is equipped with storing sections separated left and right in a horizontal direction, arranged at the upper part of the container body, and for storing two kinds of granular object to be milled. a driving rotary shaft 11 rotating integrally with a rotary operation section arranged above the container body and penetratingly arranged in the substantial center portion of the container body, two mill sections 6, 6 arranged left and right below the storing section and for milling the material to be milled, a gear coupling mechanism arranged between the driving rotary shaft 11 and the milling sections 6, 6 and which is a transmission mechanism for transmitting the rotary power of the driving rotary shaft 11 to the milling sections 6, 6, and a rotary power transmission switching means arranged in the gear coupling mechanism, shifting so as to transmit the rotary power of the driving rotary shaft 11 only either one of the left and right milling sections 6, 6, and comprising respective a pair of upper and lower ratchet gears 17, 18 left and right or others.