This invention relates to an aneurysm occluder, and more particularly but not exclusively, to an endovascular aneurysm occluder that can be inserted into an aneurysm cavity by using endovascular surgical procedures. The aneurysm occluder, includes a resiliently deformable cage (2) made of a mesh structure in which the mesh structure is cylindrical in cross section and closed off at opposite ends, where the opposite ends are held and closed off with shanks (4).