a quick connector is capable of reducing wobbling due to vibrations , and even after the retaining member is reused repeatedly , sealing property can be maintained and wobbling can be made smaller . a quick connector is provided with , a female connector member , a male connector member which fits into the female connector via a sealing member , and a retaining member which exists in a circular space between these connector members , interposed between the inner periphery of the female connector member and the outer periphery of the male connector member to be engaged therewith , thereby preventing the male connector member from coming off in the connector central line direction , wherein , a locking ring having a first fitting part which fits between the inner periphery of the retaining member and the outer periphery of the male connector member is provided on the outer periphery of the male connector member .