A safety device and a flight vehicle provided with the safety device. The safety device includes an actuator, an ejection object ejected in one direction by the activation of the actuator, a bottomed cylindrical housing lid (bottomed cylindrical member) that houses the actuator and the ejection object, and a substantially disk-shaped bottom portion that closes an opening end portion of the housing lid. One end of the first coupling member is connected to a part of the ejection object, and the other end of the first coupling member is connected to the inside of the housing lid. The actuator includes a piston member and a gas generator that generates a driving force for ejecting the housing lid by sliding the piston member and causing the piston member to abut on the housing lid and is provided on the bottom portion. One end of the second coupling member is connected to the other part of the ejection object, and the other end of the second coupling member is connected to a tip portion.