PURPOSE: To obtain the simple constitution, secure the small-sized constitution, and facilitate the handing performance by connecting two feeding pipes onto a common nozzle through each control valve.

CONSTITUTION: A feed pipe 12 connected with a hydrazine tank 14 is connected with a nozzle 10 through a feed control valve 15 and a thrust control valve 13. A feed pipe 16 connected with a cold gas tank 18 is connected through a feed control valve 19 and a thrust control valve 17, and either hydrazine 14a or cold gas 18a is selectively supplied into the nozzle 10. Therefore, in the ordinary attitude.orbit control, effective control is carried out by using the hydrazine 14a, and in the attitude.orbit control in docking, cold gas 18a is used as fuel, and the contamination of the opponent side is surely prevented. Further, two kinds of fuels are selectively jetted from the same nozzle 10, and the small-sized constitution is secured.