To provide a curling device for a can lid capable of adjusting the curl thickness, reducing the cost for the device, simple in work for changing the thickness of a flange curl part, and simple in coping with the occurrence of wear and tear.

In the curling device provided with a rotating tool 36 provided with a annular forming face 38 on the outer periphery, and a stationary tool 27 disposed on the outside of the rotating tool 36 and provided with a forming face 29, disposing a can lid 2 between the rotating tool 36 and the stationary tool 27, and forming the flange curl part 6 by bringing the outer periphery of the can lid 2 into contact with a forming faces 29, 38 to bend, the rotating tool 36 is divided into a plurality of tool components 36A, 37, and a plurality of curl outer diameter control faces 43, 44 and a curl thickness control face 45 are formed on the plurality of tool components 36A, 37 dividedly.