PROBLEM TO BE SOLVED: To provide a leaked oil recovery device which can be carried to an arbitrary place when necessary because of a flexible layout and easily stored and preserved.SOLUTION: A leaked oil catcher 1 is carried for a transformer being a treating object including an oil such as an insulating oil and the like and the leaked oil catcher 1 is arranged to receive the leaked oil of the transformer. A first oil-water separation tank 4 to efficiently perform oil-water separation is connected to the leaked oil catcher 1. Further, flow paths are alternately formed at the first oil-water separation tank 4 and oil-water separation tanks 6-8 are connected to the first oil-water separation tank 4 so that the flow of a fluid meanders.
