Provided is a floating offshore wind-power generator that is capable of moving autonomously or staying continuously in a certain place, and that has low power generating costs as a result of not needing to be moored. The floating offshore wind-power generator: can be located at a distance from populated areas, where problems such as low-frequency noise and shade occur, without compromising the landscape, and at a distance from forested areas where bird strikes occur; is able to avoid adverse weather conditions such as typhoons, gusts and lightning strikes; and is able to generate power efficiently in locations with good wind conditions. A sail (4) and a rudder (14) are provided to an elongated floating body (2). On top of the floating body is a wind power generator and a battery, which are equipped with GPS and communication equipment. The floating body determines a safe location where the wind conditions are good from long-term weather information, is capable of moving by autonomous operation, and generates wind power at a high efficiency rate. The floating body is able to travel in both directions longitudinally and moves forward even on the windward side. The floating body can thus stay at roughly the same position by repeatedly tacking, and is therefore able to function similarly to a moored floating power generator. The power that is generated is stored in a battery or the like, and the power can be extracted and used at an onshore location or the like.
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