An object of this invention is to provide a radially expandable stent (1) that holds a passageway enlarged by placing the stent (1) into a lumen. The stent (1) comprises a cylindrical frame formed by a plurality of unit structures (11, 12, . . . 16, . . . ); said unit structures (11, 12, . . . 16, . . . ) formed into a closed zig-zag configuration including an endless series of straight sections (111) and joined by bends (112), and arranged face to face into a shape of multistage; connecting members (31, 33, 35, 37 . . . ), which connect said unit structures (11, 12, . . . 16, . . . ); and a mesh (91), which is wrapped around an outside of said frame.