To provide a medical device including a substrate and a hydrophilic polymer layer formed on at least a part of the substrate, which satisfies the following conditions (a) to (d): (a) a polymer constituting the hydrophilic polymer layer is a hydrophilic polymer having an acidic group； (b) the hydrophilic polymer layer has a thickness of 1 nm or more and less than 100 nm； (c) a number ratio of basic group/acidic group of the hydrophilic polymer layer is 0.2 or less； and (d) a liquid film retention time at 40 minutes after ultrasonic cleaning in a phosphate buffer solution is 15 seconds or more. The present invention provides a medical device in which a surface of a substrate is hydrophilized, and a method for manufacturing same by a simple method.
