A mounting member that can sufficiently suppress scattering of inorganic fiber material when a pollution control element is assembled in a casing, and that can maintain sufficiently high contact pressure between the inner surface of the casing and the pollution control element, even after the organic binder has combusted. The mounting member of the present invention is for wrapping and mounting a pollution control element (30) in a casing (20), and provides a mat (1) made from inorganic fiber material, and an aggregated substance (5) containing an organic binder and inorganic fine particles that is impregnated throughout most of the mat (1).