Problem to be solved. To provide a stirrer apparatus capable of appropriately preventing a rotary vane from coming off by simple and inexpensive means without using complicated means such as providing a come-off preventing part of the rotary vane to a rotation axis; and the rotary vane for stirring. Solution. A stirrer apparatus A of this invention includes a rotary vane 1 for stirring that is detachably attachable to a rotation axis 4 from an upper side of the rotation axis, rotation axis being in a lower region in a vessel 2 that stores a stirring target matter, and rotatable following the rotation axis 4, in which a downward opening recess part 12 or a downward projecting protruded part 15 is provided in a lower surface part 11a of a central body part 11 of the rotary vane 1. At least a portion of an inner surface part of the...

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