To obtain a means which is effective in detecting an inside damage region due to a foreign body (a bird) colliding with the airframe of an airplane during its flight, due to the drop of a tool in the inspection of the airframe or due to a residual internal stress or an internal exfoliation which is introduced by a shock to the inside of the surface layer of the wing plate or the body of the airplane when an inspector makes a false step or the like outside a designated area in a nondestructive inspection and to obtain a means which restores such local damage.

The structural member is composed of a composite material in which a fiber 1 or a thin film as a magnetic shape-memory alloy is buried in a base material 2 composed of a nonmagnetic material. In the structural member, the damage of the structural member generated due to a load applied from the outside can be detected magnetically, and the damage can be restored by a shape-memory effect. The internal damage of the structural member can be detected on the basis of a change in the Barkhausen noise or permeability. The magnetic-shape memory alloy which is situated in the detected damage part can be restored when it is heated locally.