PURPOSE: To reduce cost for launching a space flight body and increase the number of times of using the space flight body.

CONSTITUTION: First and second nearly semi-conical space flight bodies 10. 11 are mounted on the tip of a rocket body 12 to be united therewith nearly conically. The space flight bodies are simultaneously launched by the use of the rocket body 12 to the cosmic space and separated therefrom independently in the outer space when it reaches the outer space and constituted to be returned independently onto the ground.