Medical device and method for producing the same

A medical device capable of being inserted into a living body, the medical device comprising:

• a resin coating layer that includes a maleic acid polymer substance,
• wherein the resin coating layer is provided on a surface of a base member of the medical device,
• wherein the resin coating layer is formed by covalently bonding the maleic acid polymer substance to a reactive functional group which exists on at least the surface of the base member of the medical device, and
• wherein the maleic acid polymer substance has a ratio of a peak height of carboxylate with respect to a total peak height of carboxylic acid ester and a carboxylic acid in a range from 1.2 to 1.7 when being measured through infrared spectroscopy, and wherein the ratio of a peak height of carboxylate with respect to a total peak height of carboxylic acid ester and a carboxylic acid in the range from 1.2 to 1.7 when being measured through infrared spectroscopy is obtained by subjecting the maleic acid polymer substance to an alkali treatment,
• wherein the maleic acid polymer substance includes a constituting unit of formula (a′), a constituting unit of formula (a″), or a combination thereof:
• wherein in formulas (a′) and (a″), X represents an alkali metal or an alkaline earth metal, and R represents a straight chain or branched alkyl group of carbon atom numbers 1 to 24.