PURPOSE: To inject a flying object by operating the internal circuits of the flying object with ignition signals so as to set it under usable condition and then igniting and combusting a squib on the flying object injected from an aircraft and the injection device for the flying object.

CONSTITUTION: Specified signals are input from an external part to an injection device 4, and transmitted into a current supply means 3 through first transmission means 6a and 6b. Also the current supply means 3 supplies current to an electronic circuit 2 only when the specified signals are input into it, and transmits supply current to an injection means 5 as injection signals through second transmission means 7a and 7b. Then the electronic circuit 2 starts to operate with current fed from the current supply means 3. On the other hand, the injection means 5, after receiving injection signals, generates combustion gas, pushes a piston 8 in the direction of arrow 9, and injects a flying object 1 from the injection device 4.