A stent (1, 101) for medical use with a proximal end side portion and a distal end side portion, comprising: a main body (10, 110) which includes a first rigid portion (20, 120) formed in a tubular shape along a longitudinal axis (C1, C100) and having a predetermined rigidity with respect to a compression force exerted in a radial direction, and a second rigid portion (30, 130) having a rigidity less than that of the first rigid portion, wherein the second rigid portion is formed in a tubular shape along the longitudinal axis (C1, C100) and successively provided to a proximal end portion of the first rigid portion (20, 120) so that the second rigid portion (30, 130) is coaxial with the first rigid portion (20, 120); and a flap (40, 140) having a proximal end portion (42, 142) fixed to the second rigid portion (30, 130), and an extension portion (41, 141) extending outward in a radial direction of the main body (10, 110) and configured to be locked to a tissue; wherein the first rigid portion (20, 120) includes a first resinous portion (21, 121, 124, 125) formed of a resin material in a tubular shape, and a first reinforcement portion (22, 122) fixed to the first resinous portion (21, 121, 124, 125) to maintain the tubular shape of the first resinous portion (21, 121, 124, 125), wherein the first reinforcement portion (22, 122) is formed in a tubular shape and is provided inside the first resinous portion (21, 121, 124, 125) to be coaxial with the first resinous portion (21, 121, 124, 125), wherein the first reinforcement portion (22, 122) is formed of a material having an elastic modulus greater than that of the first resinous portion (21, 121, 124, 125) in a tubular shape, wherein the first reinforcement portion (22, 122) is provided to be coaxial with the first resinous portion in a range from a boundary position at a connection position between the first rigid portion (20, 120) and the second rigid portion (30, 130) to a second end of the first rigid portion (20, 120) which is positioned opposite to the second rigid portion (30, 130) in a direction along the longitudinal axis (C1, C100) of the first resinous portion (21, 121, 124, 125), and wherein the first reinforcement portion (22, 122) is a coil (22, 122) formed by winding a first strand (22a, 122a) about the longitudinal axis (C1, C100); characterized in that the coil (22, 122) is provided from the boundary position to the distal end side portion. a main body (10, 110) which includes a first rigid portion (20, 120) formed in a tubular shape along a longitudinal axis (C1, C100) and having a predetermined rigidity with respect to a compression force exerted in a radial direction, and a second rigid portion (30, 130) having a rigidity less than that of the first rigid portion, a first rigid portion (20, 120) formed in a tubular shape along a longitudinal axis (C1, C100) and having a predetermined rigidity with respect to a compression force exerted in a radial direction, and a second rigid portion (30, 130) having a rigidity less than that of the first rigid portion, wherein the second rigid portion is formed in a tubular shape along the longitudinal axis (C1, C100) and successively provided to a proximal end portion of the first rigid portion (20, 120) so that the second rigid portion (30, 130) is coaxial with the first rigid portion (20, 120); and a flap (40, 140) having a proximal end portion (42, 142) fixed to the second rigid portion (30, 130), and an extension portion (41, 141) extending outward in a radial direction of the main body (10, 110) and configured to be locked to a tissue; a proximal end portion (42, 142) fixed to the second rigid portion (30, 130), and an extension portion (41, 141) extending outward in a radial direction of the main body (10, 110) and configured to be locked to a tissue; wherein the first rigid portion (20, 120) includes a first resinous portion (21, 121, 124, 125) formed of a resin material in a tubular shape, and a first reinforcement portion (22, 122) fixed to the first resinous portion (21, 121, 124, 125) to maintain the tubular shape of the first resinous portion (21, 121, 124, 125), a first resinous portion (21, 121, 124, 125) formed of a resin material in a tubular shape, and a first reinforcement portion (22, 122) fixed to the first resinous portion (21, 121, 124, 125) to maintain the tubular shape of the first resinous portion (21, 121, 124, 125), wherein the first reinforcement portion (22, 122) is formed in a tubular shape and is provided inside the first resinous portion (21, 121, 124, 125) to be coaxial with the first resinous portion (21, 121, 124, 125), wherein the first reinforcement portion (22, 122) is formed of a material having an elastic modulus greater than that of the first resinous portion (21, 121, 124, 125) in a tubular shape, wherein the first reinforcement portion (22, 122) is provided to be coaxial with the first resinous portion in a range from a boundary position at a connection position between the first rigid portion (20, 120) and the second rigid portion (30, 130) to a second end of the first rigid portion (20, 120) which is positioned opposite to the second rigid portion (30, 130) in a direction along the longitudinal axis (C1, C100) of the first resinous portion (21, 121, 124, 125), and wherein the first reinforcement portion (22, 122) is a coil (22, 122) formed by winding a first strand (22a, 122a) about the longitudinal axis (C1, C100); characterized in that the coil (22, 122) is provided from the boundary position to the distal end side portion.