An aerial vehicle safety apparatus attachable to an aerial vehicle comprising: an expandable object that can be expanded as being ejected into air; an ejection apparatus that ejects the expandable object into air; and a coupling member having one end coupled to the expandable object and the other end coupled to the ejection apparatus or configured to be coupled to the aerial vehicle , the ejection apparatus including a container accommodating the expandable object and having an opening provided on a one end side, a moving member provided in the container , the moving member including an emission base carrying the expandable object on a side of the opening and a recess defining portion that defines a recess that opens toward the side opposite to the opening, the moving member being movable along an inner wall of the container , and a driver that ejects the expandable object by moving the moving member toward the opening, the driver including a gas generator that discharges gas by being activated in response to input of an electrical signal, and the ejection apparatus being provided with a communication portion that allows communication between a space (S) located opposite to the opening when viewed from the emission base and surrounded by the container and the moving member and a space located outside the space (S) characterized in that the gas generator is inserted in the recess defining portion as being arranged in the recess, and a sealing member is provided between the recess defining portion and the gas generator . an expandable object that can be expanded as being ejected into air; an ejection apparatus that ejects the expandable object into air; and a coupling member having one end coupled to the expandable object and the other end coupled to the ejection apparatus or configured to be coupled to the aerial vehicle , the ejection apparatus including a container accommodating the expandable object and having an opening provided on a one end side, a moving member provided in the container , the moving member including an emission base carrying the expandable object on a side of the opening and a recess defining portion that defines a recess that opens toward the side opposite to the opening, the moving member being movable along an inner wall of the container , and a driver that ejects the expandable object by moving the moving member toward the opening, the driver including a gas generator that discharges gas by being activated in response to input of an electrical signal, and a container accommodating the expandable object and having an opening provided on a one end side, a moving member provided in the container , the moving member including an emission base carrying the expandable object on a side of the opening and a recess defining portion that defines a recess that opens toward the side opposite to the opening, the moving member being movable along an inner wall of the container , and a driver that ejects the expandable object by moving the moving member toward the opening, the driver including a gas generator that discharges gas by being activated in response to input of an electrical signal, and the ejection apparatus being provided with a communication portion that allows communication between a space (S) located opposite to the opening when viewed from the emission base and surrounded by the container and the moving member and a space located outside the space (S) characterized in that the gas generator is inserted in the recess defining portion as being arranged in the recess, and a sealing member is provided between the recess defining portion and the gas generator . <EOS>