Abstract: An improved self-sealing-type double tube joint which has a pair of tubular outer shell 11, 21, each of which having a tubular inner barrier wall 12, 22 fixed therein so as to form a double flow passage. The tubular barrier wall 22 in a male outer shell 21 is closed at front end 23 therof, and a side passage 24 connecting to the flow passage 1 is formed in a side wall of the tubular barrier wall. A male-side ring-like movable valve element 41 is slidably mounted on the tubular inner barrier wall 22 so that the valve element 41 shuts the side passage and faces against an end surface of a tubular barrier wall 12 of the female outer shell 11. A female-side ring-like movable valve element 51 is mounted on the inner tubular barrier wall 12 in the female outer shell 11 so as to face against an end surface of the male tubular outer shell 21.