Safety device, and flying body provided with safety device

A safety apparatus comprising:

• a container having a bottomed cylindrical shape and including an opening end at one end;
• a lid including, at an edge, a projection in contact with a side wall of the container, and configured to close the opening end before operation and open the opening end of the container after operation;
• an ejector that is installed inside the container and ejects an ejected object accommodated in the container;
• and
• an engagement mechanism that performs engagement between a side wall of the opening end and the projection by inserting a pin member into a first through hole penetrating toward a center of the container in the side wall of the opening end and a second through hole penetrating toward a center of the lid in the projection;
• wherein the ejector includes a push-up member that pushes up the lid during operation, in the engagement mechanism, when the lid is pushed up by the push-up member during operation, at least the first through hole or the second through hole is broken by the pin member, or the pin member is broken by the first through hole or the second through hole, and the engagement is released, and in the locking mechanism, when the lid is pushed up by the push-up member during operation, the locking is released.