The charging system according to one aspect includes a base located underwater, a pole extending in the vertical direction, a charging station having a power feeding unit, a submersible body, a power receiving unit, and a pole in contact from the traveling direction side. A holding device having a pair of guide portions for guiding to the holding position and a holding portion for relatively rotatably holding the pole guided to the holding position, a thrust generator for generating thrust in the horizontal direction, and a thrust generator. AUV having a control device for controlling the above, and a light emitter and a light receiver are provided on one side and the other side of the base and the submersible body, respectively. The thrust generator is controlled so that it is in a rotational position to receive the light emitted from the emitter.
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