Provided are a catheter and method for producing a catheter which make it possible to maintain a favorable bonding strength of resin materials of different hardnesses on a distal side and proximal side, and possible to effectively prevent peeling of a junction. An inner catheter (30) is disposed in a lumen of a guiding catheter (20) so as to be able to be pulled out, and is used along with the guiding catheter (20). The inner catheter (30) includes a distal tubular section (71) which is made of resin and located on a distal side, and a proximal tubular section (72) which is made of resin of a greater hardness than that of the distal tubular section (71) and which has a distal-side end section that is joined to a proximal-side end section of the distal tubular section (71). The distal-side end section of the proximal tubular section (72) includes: a taper section (75) that gradually decreases in outer diameter toward the distal side and is located on the radially inward side of the distal tubular section (71)； and a coverage section (76) that protrudes out toward the distal side from a proximal-side site of the taper section (75) and surrounds the radially outward side of the proximal-side end section of the distal tubular section (71). The distal tubular section (71) includes a wedge section (77) that is sandwiched between the taper section (75) and the coverage section (76).La présente invention concerne un cathéter et un procédé de production d'un cathéter qui permet de maintenir une force de liaison favorable entre matériaux de résine de duretés différentes sur un côté distal et un côté proximal, ainsi que d'empêcher efficacement le décollement d'une jonction. Un cathéter interne (30) est disposé dans une lumière d'un cathéter de guidage (20) de façon à pouvoir être retiré, et est utilisé conjointement avec le cathéter de guidage (20). Le cathéter interne (30) comprend une section tubulaire distale (71) qui est constituée de résine et située sur un côté distal, e
