A medical stent comprising: an outer layer configured to have a longitudinal axis and formed in an approximately tubular shape along the longitudinal axis with a first resin material; a coil formed by winding a wire around a given axis and provided on the inner circumference side of the outer layer coaxially with the outer layer; an inner layer formed in an approximately tubular shape and provided on the inner circumference side of the coil coaxially with the outer layer; an elastic member formed of a second resin material which is different from the first resin material, a melting temperature of the second resin material is higher than a melting temperature of the first resin material, and configured to have one end portion (6a, 9a) connected to an end portion of the outer layer and another end portion formed to extend to the central portion side of the outer layer along the longitudinal axis and also to direct to an outside in the radial direction of the outer layer, and a treated layer formed between the end portion of the outer layer and the one end portion (6a, 9a) of the elastic member and configured to have a hydroxyl group or carbonyl group for joining the end portion of the outer layer and the one end portion (6a, 9a) of the elastic member to each other; wherein the treated layer is formed by chemically treating and reforming the outer circumferential surface of the one end portion (6a, 9a) of the elastic member, the end portion of the outer layer and a surface-treated section (6b, 9b) of the one end portion (6a, 9a) of the elastic member are connected to each other at a temperature equal to or higher than a melting temperature of the first resin material and lower than the melting temperature of the second resin material, and the hydroxyl group or the carbonyl group formed in the treated layer is bonded to a functional group of the first resin material. an outer layer configured to have a longitudinal axis and formed in an approximately tubular shape along the longitudinal axis with a first resin material; a coil formed by winding a wire around a given axis and provided on the inner circumference side of the outer layer coaxially with the outer layer; an inner layer formed in an approximately tubular shape and provided on the inner circumference side of the coil coaxially with the outer layer; an elastic member formed of a second resin material which is different from the first resin material, a melting temperature of the second resin material is higher than a melting temperature of the first resin material, and configured to have one end portion (6a, 9a) connected to an end portion of the outer layer and another end portion formed to extend to the central portion side of the outer layer along the longitudinal axis and also to direct to an outside in the radial direction of the outer layer, and a treated layer formed between the end portion of the outer layer and the one end portion (6a, 9a) of the elastic member and configured to have a hydroxyl group or carbonyl group for joining the end portion of the outer layer and the one end portion (6a, 9a) of the elastic member to each other; wherein the treated layer is formed by chemically treating and reforming the outer circumferential surface of the one end portion (6a, 9a) of the elastic member, the end portion of the outer layer and a surface-treated section (6b, 9b) of the one end portion (6a, 9a) of the elastic member are connected to each other at a temperature equal to or higher than a melting temperature of the first resin material and lower than the melting temperature of the second resin material, and the hydroxyl group or the carbonyl group formed in the treated layer is bonded to a functional group of the first resin material.