A stent formed substantially as a tube which has a form in which a plurality of wavy annular members is arranged adjacently to each other in an axial direction of said stent with said adjacent wavy annular members connected with each other, has a diameter whose dimension is so set that said stent can be inserted into a lumen inside a living body, and can be expanded when a force spreading radially from an inside of said tube is applied to said stent, wherein said wavy annular member has parallel straight-line portions extended in parallel with an axis of said stent when said stent is compressed and at a stent-manufacturing time; and said stent has connection portions each connecting opposed ends of said parallel straight-line portions of said adjacent wavy annular members to each other, wherein two parallel straight-line portions connected to each other with said connection portion are almost aligned to each other, characterized in that there are two connection portions connecting adjacent wavy annular members to each other, wherein the connecting portions are provided at opposed positions, wherein said connection portions adjacent to each other in said axial direction of said stent are shifted from each other in a direction orthogonal to said axis of said stent, wherein said wavy annular member includes a plurality of modified M-shaped linear portions, continuous with each other, each of which has four linear portions composed of said parallel straight-line portion, a first inclined straight-line portion which is connected with one end of said parallel straight-line portion through a bent portion and becomes oblique to said axis of said stent at a predetermined angle at least when said stent expands, an inclined curved line portion which is connected with one end of said first inclined straight-line portion through a bent portion and extended obliquely at a predetermined angle to said axis of said stent, and a second inclined straight-line portion connected with one end of said inclined curved line portion through a bent portion and becomes oblique to said axis of said stent at a predetermined angle at least when said stent expands. wherein two parallel straight-line portions connected to each other with said connection portion are almost aligned to each other, characterized in that there are two connection portions connecting adjacent wavy annular members to each other, wherein the connecting portions are provided at opposed positions, wherein said connection portions adjacent to each other in said axial direction of said stent are shifted from each other in a direction orthogonal to said axis of said stent, wherein said wavy annular member includes a plurality of modified M-shaped linear portions, continuous with each other, each of which has four linear portions composed of said parallel straight-line portion, a first inclined straight-line portion which is connected with one end of said parallel straight-line portion through a bent portion and becomes oblique to said axis of said stent at a predetermined angle at least when said stent expands, an inclined curved line portion which is connected with one end of said first inclined straight-line portion through a bent portion and extended obliquely at a predetermined angle to said axis of said stent, and a second inclined straight-line portion connected with one end of said inclined curved line portion through a bent portion and becomes oblique to said axis of said stent at a predetermined angle at least when said stent expands.