To provide a revolving notification device and a revolving notification method, capable of improving safety at the revolving of a rear-wheel-steering type vehicle.SOLUTION: A revolving notification device according to an embodiment comprises: a revolving detection part; and a notification part. The revolving detection part detects a revolving operation in a rear-wheel-steering type own vehicle. The notification part notifies that a traveling track at the revolving is deviated to the outside from a position of the vehicle before the revolving when the traveling track at the revolving is deviated to the outside from the position of the vehicle before the revolving.SELECTED DRAWING: Figure 1B
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