A double-pipe joint for connecting and coupling a double pipe consisting of outer and inner pipes made of a fluororesin tube. An inner joint portion for coupling the inner pipe is formed by: a sleeve which is to be pressingly fitted into an inner-pipe end portion; an inner-pipe joint body which is to be fitted onto the end portion; and an inner-pipe union nut. An outer joint portion for coupling the outer pipe is formed by: a sleeve which is to be pressingly fitted into an outer-pipe end portion; an outer-pipe joint body which is to be fitted onto the end portion; and an outer-pipe union nut. The inner-pipe union nut and the outer-pipe joint body are formed integrally into a nut-equipped body.