A process for producing a catheter comprises mixing ETFE and PTFE in a mass ratio of from 99:1 to 45:55 to form a mixture, forming the mixture into a tubular body, forming a reinforcement layer and a resin layer on said tubular body to form a catheter configured to be positioned in a lumen of a living body, sealingly packaging the catheter to produce a packaged catheter, and sterilizing the packaged catheter with electron beam irradiation.