Exhaust-gas purification apparatus and method for manufacturing same

An exhaust gas purification device comprising a honeycomb substrate having a plurality of exhaust gas flow paths separated by a porous wall, and one or more catalyst noble metals which are carried by the honeycomb substrate, wherein

• the honeycomb substrate includes ceria-zirconia composite oxide particles as a constituent material,
• the catalyst noble metals are selected from the group consisting of platinum, palladium, and rhodium,
• the honeycomb substrate has:
• a noble metal-enriched surface part in which a 50 mass % noble metal carrying depth of a specific noble metal, which is one of the one or more catalyst noble metals, is less than 50% of the distance from a surface of the porous wall to a center of an interior of the porous wall, and
• the 50 mass % noble metal carrying depth is a depth in which 50 mass % of the specific noble metal is carried based on a quantity of the specific noble metal carried from the surface of the porous wall to the center of the interior of the porous wall.