Charging system for autonomous underwater vehicle and method of lifting and recovering autonomous underwater vehicle

A charging system includes a charging station having: a base underwater; a pole extending in an upper-lower direction; and a power supplying portion. An AUV includes: an underwater main body; a power receiving portion; a holding device including a pair of guide and holding portions, the pair of guide portions guides the pole to a holding position after the pole contacts the guide portions from a proceeding-direction, the holding portion holds the pole to be rotatable relative to the pole; a thrust generating apparatus generates in a horizontal direction; and a control device controls the thrust generating apparatus. A light emitter at one of the base and the underwater main body, and a light receiver is provided at the other. The control device controls the thrust so the underwater main body reaches a rotational position where the light receiver receives light emitted, the rotational position set relative to the pole.