A quick connector with sealing capacity for preventing the leakage and penetration of fuel and the entrance of foreign matters, such as mud, and water past a retainer. The quick connector includes a housing (12) internally provided with first sealing rings (29) and (30) for sealing a gap between the metallic surface of an uncoated end part of a tube (16) and the inside surface of the housing (12), and second sealing rings (33) and (34) for sealing a gap between the surface of a coated part of the tube (16) and the inside surface of the housing (12).