To provide a flying body failure detection system that can shorten time to start a safety device in an emergency more than before, and to provide a device for deploying a parachute or paraglider and an air bag device.SOLUTION: A flying body failure detection system 10 includes: a power supply 11 mounted to a flying body with a safety device and constituted of three cells 11a, 11b, 11c; a cell voltage measurement part 12 for measuring voltages of those cells for each cell; and a failure determination part 13 for determining a failure in the power supply by comparing a measurement value of a voltage of each cell to a preset threshold for each cell.SELECTED DRAWING: Figure 1
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