To attain a high lift, a sufficient motion performance and an aerodynamic stability performance by arranging a stabilizing wing and a steering wing having a sufficient wing area in front of a canister while separating from the body and providing a mechanism being coupled with the stabilizing wing and the steering wing when the body is separated from the canister.

A stabilizing wing 3 and a steering wing 2 are separated from the body 1 and contained in a wing containing tube 5 fixed to the front of a canister 4. At the time of launching, a stabilizing wing supporting part 7 is inserted into the wing 3 and a steering wing supporting part 8 is inserted into the wing 2 by the frictional force between a pad 6, and the wings 2, 3. The wing 3 meshes the supporting part 8 and the body 1 is coupled with the wings 2, 3 and separated from the canister 4. Frictional force between the pad 6 and the wings 2, 3 is larger than that when the supporting part 7 is inserted into the wing but lower than the thrust of a rocket motor. Since the wings 2, 3 are fixed to the body after launching, a large lift is produced and aerodynamic stability performance is enhance.