In a double-pipe joint for connecting and coupling a double pipe (H) consisting of outer and inner pipes (h2, h1) made of a fluororesin tube, an inner joint portion (T1) for coupling the inner pipe is formed by: a sleeve (2) which is to be pressingly fitted into an inner-pipe end portion (h1t); an inner-pipe joint body (1) which is to be fitted onto the inner-pipe end portion; and an inner-pipe union nut (3A), and an outer joint portion (T2) for coupling the outer pipe is formed by: a sleeve (4) which is to be pressingly fitted into an outer-pipe end portion (h2t); an outer-pipe joint body (3B) which is to be fitted onto the outer-pipe end portion; and an outer-pipe union nut (5). The inner-pipe union nut (3A) and the outer-pipe joint body (3B) are formed integrally into a nut-equipped body (3).