PURPOSE: To form a minimum gap between two spacecraft by providing the opening planes of two docking ports set at oblique angles with each other on the pressure vessel of a docking device connecting two spacecraft.

CONSTITUTION: This docking device 20 docking a first spacecraft 10 such as a space shuttle or an orbiter and a second spacecraft 12 such as a space platform arranged with personnel periodically supplied from the spacecraft 10 is provided with a rigid and follow pressure vessel 22. The pressure vessel 22 is provided with two docking ports 24, 28 communicating with the interior passages of the spacecraft 10, 12, and the opening planes of the ports 24, 28 are set at oblique angles with each other. The pressure vessel 22 is provided with an interface port 56, and a fixed mounted object 38 in the cargo room of the spacecraft 10 can be communicated with the port 56 via a tunnel 58.