Patent ID: 7820044

Claim:
A fluid filter comprising: a filter element; a case in which an inflow path, an outflow path, and a drainage path are formed, the case including a protruding portion provided on a peripheral side of an opening of said drainage path; a cap which is engaged with said case through axial rotation; a biasing device which biases the filter element housed inside a casing constituted by said case and said cap toward said case side; a rotation restricting device which restricts rotation of said filter element in a fastening direction when said cap is rotated relative to said case in said fastening direction; and a sealing member provided on an axial end surface side of said filter element, which seals said drainage path when said filter element is biased by said biasing device and rotation thereof is restricted by said rotation restricting device, wherein said sealing member includes a flat plate-form sealing portion capable of blocking said opening of said drainage path, wherein said rotation restricting device includes the protruding portion provided on said case and an abutting portion provided on a side surface portion of said flat plate-form sealing portion, the abutting portion abuts said protruding portion when said filter element is rotated in said fastening direction, wherein said cap supports said filter element such that said filter element rotates together with said cap in a loosening direction thereof, thereby releasing the seal applied to said drainage path by said flat plate-form sealing portion.