The present invention provides a rotary connector which can reduce the cost of stator casing or rotor casing even the sheet numbers of flat cables are different thereby realizing the low cost of product. The rotary connector is installed with one piece of flat cable in the receiving space formed between the stator casing and the rotor casing. Needle shaped terminal group fixed on the insulating substrate of lead block is connected with the end of flat cable. An insulating substrate is installed on the casing. The needle shaped terminal casing is integratedly configured on one side area which is obtained through approximately bisecting the exposed end plane of insulated substrate, and the other side area is not configured with the needle shaped terminal. One piece of flat cable is additionally installed at the state the number of connected circuit is many. The other needle shaped terminal group which is connected with the flat cable can be integratedly configured on the other side areaof exposed end plane. The lead block can be formed through the insulated subtrates with same size and shape. The stator casing or rotor casing can be used commonly.