PROBLEM TO BE SOLVED: To provide an air filter that can surely prevent entry of an insect through between a filter material for an air filter and a frame body.SOLUTION: The air filter comprises a filter material, an outer frame and an inner frame. The inner frame is arranged inside an opening part of the outer frame, which is an integrated member formed in a circumference shape along an end of the outer frame constituting the opening part. The outer frame has a first wall part which supports an end part at the outer periphery side of the filter material, from a first side, one side in a direction in which gas passes through the filter material. The inner frame has: a pressing part which presses the end part at the outer periphery side of the filter material against the first wall part side and compresses the end part, from a second side at the opposite side, in the direction in which the gas passes through the material, of the first side and a locking part which in a pressed state where the filter material is pressed against the wall part, locks the inner frame to the outer frame so that the inner frame does not move in the direction in which the gas passes through the material relative to the outer frame.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2017,JPO&INPIT【課題】エアフィルタ用濾材と枠体の間から虫が侵入するのを確実に防止することのできるエアフィルタを提供する。【解決手段】エアフィルタは、濾材と、外枠と、内枠と、を備える。前記内枠は、前記外枠の開口部の内側に配置される内枠であって、前記開口部をなす前記外枠の端に沿って周状に形成された一体の部材である。前記外枠は、前記濾材を気体が通過する方向の一方の側である第1の側から前記濾材の外周側の端部を支持する第1の壁部を有している。そして、前記内枠は、前記第1の側と前記気体が通過する方向の反対側である第2の側から前記濾材の外周側の端部を前記第1の壁部側に押し付けて圧縮させる押付部と、前記濾材が押し付けられた押付状態で、前記外枠に対して前記気体が通過する方向に移動しないよう前記内枠を前記外枠に係止させる係止部と、を有する。【選択図】図5
