Exhaust purification catalyst device

An exhaust gas purification catalyst device has a substrate 110, an upstream-side lower coating layer 121, an upstream-side upper coating layer 122, a downstream-side lower coating layer 131, and a downstream-side upper coating layer 132, and satisfies (i) and (ii). (i) the concentration of Pt and/or Pd in the upstream-side upper coat layer 122 and the downstream-side lower coat layer 131 is higher than the concentration of Pt and/or Pd in the upstream-side lower coat layer 121 and higher than the concentration of Pt and/or Pd in the downstream-side upper coat layer 132; (ii) The concentration of Rh in the upstream-side lower coat layer 121 and the downstream-side upper coat layer 132 is higher than the concentration of Rh in the upstream-side upper coat layer 122 and higher than the concentration of Rh in the downstream-side lower coat layer 131. 一种排气净化催化剂装置，具有基材110、上游侧下层涂层121、上游侧上层涂层122、下游侧下层涂层131以及下游侧上层涂层132，满足(i)和(ii)。(i)上游侧上层涂层122和下游侧下层涂层131中的Pt和/或Pd的浓度高于上游侧下层涂层121中的Pt和/或Pd的浓度、且高于下游侧上层涂层132中的Pt和/或Pd的浓度；(