To attain the common use of a water supply connector for fitting a water supplied means to different types of faucets.

A water supply connector 30 for communicating an ionic water generator 1 (a supplied connector) with a faucet 20 at the time of fitting the ionic water generator 1 to the faucet 20 through a fixture 40 is formed in cylindrical shape with a through hole 32 (a communicating hole) inside. In this case, the water supply connector has a large diameter cylindrical part 31 (a first connection part) with an internal thread 32a formed on the one-end side inner peripheral surface so as to be thread- fastened to an external thread 21 formed at the tip part periphery of the faucet 20, and a small diameter cylindrical part 35 (a second connection part) with an external thread 35a formed at the other-end side outer periphery so as to be thread-fastened to an internal thread formed at the tip inner periphery of the faucet 20. In case of connecting the large diameter cylindrical part 31 to the faucet 20, the small diameter cylindrical part 35 is made to correspond to an intake 10 of the ionic water generator 1, and in case of connecting the small diameter cylindrical part 35 to the faucet 20, the large diameter cylindrical part 35 is made to correspond to the intake 10 of the ionic water generator 1 so as to be able to cope with different types of faucets.