To effectively purify a PM(particulate matter) with large particle diameter.

A wash coat layer 14b consisting of a porous substance having a pore with the diameter of 20 to 30 mm and cerium complex oxide (for example, ceria CeO2) is formed at the surface of a substrate 14a of a catalyst carrier inserted in an exhaust passage of a cylinder injection system engine, and noble metal (for example, platinum Pt) as an active component and rare earth metal (for example, cerium Ce) as an additive component are scattered and carried on the porous substance. This makes the PM with the large diameter, contained in the exhaust emission, be trapped in the pore of the porous substance, and suppressed to exhaust as not purified. The PM trapped in the porous substance is converted into the innoxious CO2 (carbon dioxide) with synergy of the active component and the additive component carried herein by oxidizing from the relatively low temperature. In such a way, the trapping and oxidizing of the PM are repeated, and the continuous purifying of the PM is realized.