FILTER PACK, AND AIR FILTER

To easily remove fine particles held on a filter medium in a filter pack provided with the pleated filter medium.SOLUTION: A filter pack includes a pleated filter medium and a surrounding member which surrounds the filter medium circumferentially. The surrounding member includes two first fixing parts which sandwich the filter medium from both sides in an extension direction of a fold, and two second fixing parts which sandwich the filter medium from both sides in a direction orthogonal to the extension direction of the fold and a direction of an air flow passing through the filter medium. A displacement amount of the second fixing part along an orthogonal direction when the filter pack is compressed or elongated in the orthogonal direction becomes larger at the second fixing part which is farther from the first fixing part. A length of the filter pack along the orthogonal direction at the first position in a direction parallel to the extension direction of the fold is longer than at the second position in which the displacement amount of the second fixing part is smaller than the first position.SELECTED DRAWING: Figure 1 【課題】プリーツ加工が施された濾材を備えるフィルタパックにおいて、濾材に保持された微粒子を容易に除去する。【解決手段】フィルタパックは、プリーツ加工が施された濾材と、濾材を周状に囲む囲み部材と、を備える。囲み部材は、折り目の延在方向の両側から濾材を挟む２つの第１の固定部と、折り目の延在方向及び濾材を通過する気流の方向と直交する方向の両側から濾材を挟む２つの第２の固定部と、を有している。フィルタパックを直交する方向に圧縮又は伸長させたときの直交する方向に沿った第２の固定部の変位量は、第１の固定部から離れた第２の固定部の部分であるほど大きい。直交する方向に沿ったフィルタパックの長さは、折り目の延在方向と平行な方向における第１の位置において、第１の位置よりも第２の固定部の変位量が小さい第２の位置よりも長い。【選択図】図１