A collection filter with which various chlorinated organic compounds contained in either a particulate or gaseous state in a fluid are simultaneously collected and the chlorinated organic compounds collected can be easily extracted. The collection filter (7) comprises: a fluid-permeable molding comprising a fibrous material and an inorganic binder for binding the fibers to one another; and held in the molding a hydrophobic material having higher hydrophobicity than the fibrous material and inorganic binder. The collection filter (7) is disposed in a holder (6) having a discharge passage (12a). When a sample gas containing various chlorinated organic compounds is introduced from a flue (25) into the holder (6) via a collection pipe (2) and an introduction pipe (8), then the various chlorinated organic compounds, including dioxins, contained in either a particulate or gaseous state in the sample gas are collected with the collection filter (7) when the gas passes therethrough. The compounds collected are discharged outward from the discharge passage (12a).