Apparatus for adjusting rigidity of vehicle body

An apparatus (22) for adjusting the rigidity of vehicle body can appropriately control the rigidity of a vehicle body. An apparatus (22) for varying rigidity includes a plurality of (e.g. three) plate-like members (31) comprising shape-memory alloy, and a plurality of (e.g. two) connecting-disconnecting members (32) that are detachably connected to the plate-like members (31). Each connecting-disconnecting member (32) includes a base member (43) that detachably connects to the plurality of plate-like members via a connecting member fitted to each plate-like member, a plurality of pairs of pin guides and movable pin members (45) that are fitted to the base member, and a plurality of (e.g. two) actuators that are controlled by an unillustrated controller.