Abstract: To provide an agitator which allows easy disassembly and reassembly thereof and washing of every component separately, thus securing satisfactory workability and in turn safety of foods and quality stability of chemicals, and moreover effectively preventing the entrained rotation of the material to enhance the agitating effect.

Abstract: A partitioning device is provided on a mixer wherein a bowl is held on the front side of the pillar of the machine body, and a mixing tool is rotated in the bowl by a mixing shaft which extends downward from a head protruding forward from the upper part of the pillar. The partitioning device includes a partitioning member, which has an annular rail and a surface member, a fixed roller(s) and a movable roller(s), which fit with the rail of the partitioning member, a fixed roller supporting means, which supports the fixed roller so that the fixed roller is prevented from shifting in relation to the machine body, and a movable roller supporting means, which supports the movable roller so that the distance between the movable roller and the fixed roller can be varied, and biases the movable roller in a direction to move toward the fixed roller.