An exhaust gas purifying catalyst comprising a substrate and catalyst portions provided in the substrate, the substrate including: inflow-side cells, each inflow-side cell being a space having an open end on an inflow side thereof and a closed end on an outflow side thereof in an exhaust gas flow direction; outflow-side cells, each outflow-side cell being a space having a closed end on an inflow side thereof and an open end on an outflow side thereof in the exhaust gas flow direction; and porous partition walls, each partition wall separating the inflow-side cell from the outflow-side cell, and the catalyst portions including: (group A) first catalyst portions, each first catalyst portion being provided at least on a part of a surface of the partition wall that faces the inflow-side cell; and (group B) second catalyst portions, each second catalyst portion being provided at least on a part of a surface of the partition wall that faces the outflow-side cell, wherein each catalyst portion of one of group A and group B includes at least one oxidizing catalyst layer and at least one reducing catalyst layer, and each catalyst portion of the other of group A and group B includes at least one oxidizing catalyst layer and/or at least one reducing catalyst layer, and wherein one of the first catalyst portion and the second catalyst portion includes a stack of an oxidizing catalyst layer and a reducing catalyst layer, and the other of the first catalyst portion and the second catalyst portion is a single oxidizing catalyst layer, a single reducing catalyst layer, or a stack of an oxidizing catalyst layer and a reducing catalyst layer. inflow-side cells, each inflow-side cell being a space having an open end on an inflow side thereof and a closed end on an outflow side thereof in an exhaust gas flow direction; outflow-side cells, each outflow-side cell being a space having a closed end on an inflow side thereof and an open end on an outflow side thereof in the exhaust gas flow direction; and porous partition walls, each partition wall separating the inflow-side cell from the outflow-side cell, and the catalyst portions including: (group A) first catalyst portions, each first catalyst portion being provided at least on a part of a surface of the partition wall that faces the inflow-side cell; and (group B) second catalyst portions, each second catalyst portion being provided at least on a part of a surface of the partition wall that faces the outflow-side cell, wherein each catalyst portion of one of group A and group B includes at least one oxidizing catalyst layer and at least one reducing catalyst layer, and each catalyst portion of the other of group A and group B includes at least one oxidizing catalyst layer and/or at least one reducing catalyst layer, and wherein one of the first catalyst portion and the second catalyst portion includes a stack of an oxidizing catalyst layer and a reducing catalyst layer, and the other of the first catalyst portion and the second catalyst portion is a single oxidizing catalyst layer, a single reducing catalyst layer, or a stack of an oxidizing catalyst layer and a reducing catalyst layer. (group A) first catalyst portions, each first catalyst portion being provided at least on a part of a surface of the partition wall that faces the inflow-side cell; and (group B) second catalyst portions, each second catalyst portion being provided at least on a part of a surface of the partition wall that faces the outflow-side cell, wherein each catalyst portion of one of group A and group B includes at least one oxidizing catalyst layer and at least one reducing catalyst layer, and each catalyst portion of the other of group A and group B includes at least one oxidizing catalyst layer and/or at least one reducing catalyst layer, and wherein one of the first catalyst portion and the second catalyst portion includes a stack of an oxidizing catalyst layer and a reducing catalyst layer, and the other of the first catalyst portion and the second catalyst portion is a single oxidizing catalyst layer, a single reducing catalyst layer, or a stack of an oxidizing catalyst layer and a reducing catalyst layer.