An aircraft collapsing device that collapses an aircraft fuselage inward includes: a gate-shaped shell which covers a circumference of both sides and an upper portion of a fuselage of an aircraft body from which horizontal wings and a vertical wing have been decoupled, a wedge-shaped pressing member that is mounted to an upper portion of the shell to press at least one portion of a circumference of at least one of annular frames juxtaposed in a longitudinal direction of the fuselage toward a center of the fuselage, a pair of sidewall pressing members that is mounted to both sides of the shell to press the fuselage simultaneously from two directions crossing a pressing direction of the wedge-shaped pressing member at the center of the fuselage after pressing by the wedge-shaped pressing member, and a moving unit that moves the fuselage of the aircraft and the shell relative to one another.