To easily and quickly attach/detach a barrel without difficulties, and to prevent the occurrence of ratting noise during grinding.

The mounting barrel is used for a barrel grinder which is composed of a case substrate 31 having a rotary shaft 32, a barrel case 38 composed of a cone spring 33, which is provided to the case substrate 31 and presses the mounted barrel 39 to the escaping direction, and a leaf spring 36, which is similarly provided to the case substrate 31 and suppresses the escape of the mounted barrel 39, and to which a suppressing piece 37 for pressing the barrel 39 to the inside is mounted, and the barrel 39 which is mounted to the barrel case 38 and has an engaging part 42 engaged with the suppressing piece 37.