To provide a simple and inexpensive stirring device enabling a planetary motion which rotates on its axis together with a revolution.

A rotation holder 5 carries out the revolution centering a revolution shaft 4 by rotating the rotation holder 5 through the revolution shaft 4, and is inclined to the outside by a centrifugal force. At the same time, a flange portion 8a of a container holder 8 attached to the container holding member 6 contacts a capping part 10, by which a container holder 8 rotates on its axis. The container holder 8 carries out the planetary motion of rotating on its axis together with the revolution, by which the centrifugal force by the revolution and the centrifugal force by an autorotation act on a material inside a kneading container 9 to accelerate the kneading by the stirring of the material.

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