The invention provides an aluminum fin material which can apply a material which is generated through decomposition polyethylene glycol and is used as a reasonable material for nest-shaped corrosion, namely low-molecular-weight carboxylic acid of formic acid, on a hydrophilic coating. Simultaneously in manufacture of a heat exchanger and using as an air conditioner, the aluminum fin material can suppress generation of low-molecular-weight carboxylic acid. The aluminum fin material (10) is characterized in that: the aluminum fin material is provided with a substrate (1) which is made of aluminum, and the hydrophilic coating (4) which is formed on the surface and contains a compound with oxiranyl as structural units. The hydrophilic coating (4) further contains an alkali metal or an alkali metal compound which represents alkali in hydrolysis, so that pH of extracted water from the hydrophilic coating is above 5.