A disengage device in an aircraft, which prevents a driving force of a drive unit from transmitting to a control surface, having:a first rod having one end portion connected to the drive unit, the other end portion, and a hollow portion formed to have a predetermined length and open at the other end portion;a branch pipe which is connected to a side wall of the first rod and communicates with the hollow portion;a second rod having one end portion connected to the push-pull rod, the other end portion, and a recess portion formed in a part of a side wall of a portion which extends a predetermined length from the other end portion to the one end portion side and is inserted in the hollow portion; andan engaging member arranged to be freely movable in the branch pipe, which is engagable with the recess portion.