An aerial vehicle safety apparatus includes a piston member, a cylinder that accommodates the piston member and is provided with a hole through which the piston member protrudes outward at time of operation, a push-up member that is pushed up in one direction by the piston member, an expandable object that is pushed up while being supported by the push-up member, a gas generator as a power source that moves the piston member in the cylinder, and a first member and a second member that serve as a cylindrical container that accommodates the piston member, the cylinder, the push-up member, the expandable object, and the gas generator. The expandable object is stored in the container so as to form a plurality of layers in a radial direction.