To provide a winding device capable of more surely fixing a separator to a core while attaining improvement of productivity or reduction of cost of manufacture. In a winding device 11, after two separators 3 and 4 are fixed to a core 2 by fixing means 41, while rotating the winding core 2 based on operation of a winding core 20, a plus electrode foil 5 and a minus electrode foil 6 are taken up while being insulated mutually via the separators 3 and 4. On an outer peripheral surface of the core 2, a concave part 2A in a projected shape is present outsides and starting end side portions of the separators 3 and 4 are curved along at least the projecting part 2A of the core 2 by curving means 51, such that starting ends of the separators 3 and 4 are deviated from each other. In the state where the starting end side portions of the separators 3 and 4 are curved, an adhesive tape TP is stuck to the separators 3 and 4 and the core 2 so as to be spread over the starting ends of the separators 3 and 4 and the core 2 by the fixing means 41.