AIR FILTER, AIR PURIFIER PROVIDED WITH AIR FILTER, AND METHOD FOR PRODUCING AIR FILTER

摘要

This air filter is provided with a base part (12) and a fiber layer (13) that is arranged on the surface of the base part (12). The fiber layer (13) is configured of a first nanofiber assembly (13a) and a second nanofiber assembly (13b). The first nanofiber assembly (13a) is arranged at the farthest side from the base part (12), and the weight per square meter of the first nanofiber assembly (13a) is higher than the weight per square meter of the second nanofiber assembly (13b). In addition, the first nanofiber assembly (13a) has a larger average fiber diameter than the second nanofiber assembly (13b).