To provide an autonomous mobile device for accurately prevents itself from dropping. An acquisition unit 11 of the autonomous mobile device 100 acquires a value of difference in height between a floor surface and its device. A determination unit 12 determines whether the value of difference in height acquired by the acquisition unit 11 is equal to or more than a prescribed value or not. A moving restriction unit 13 restricts parallel movement of the device if the determination unit 12 determines that it is equal to or more than the prescribed value.