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 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 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 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 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.