Abstract: This invention relates to a coffee mill which comprises two grinding devices, each device being formed of a fixed annular grinder (1,1') and a rotary annular grinder (3,3') which are mounted in opposition the one to the other. The grinding devices are coaxially superposed. The rotary grinders (3,3') of the two devices are rotated by a single axle (5,5') connected to a single driving motor (M) with a double rotation direction, and the cutting means of one of the pairs of grinders are oriented for a right hand cutting, whereas those of the other pair of grinders are oriented for a lefthand cutting.