An exhaust gas purifying catalyst of wall flow type to be disposed in an exhaust pipe of an internal combustion engine for purifying exhaust gas discharged from the internal combustion engine by reacting the exhaust gas with a reducing agent, the exhaust gas purifying catalyst comprising: a base of a wall flow structure having an inlet-side cell in which only an end portion on an exhaust gas inflow side is open, an outlet-side cell which is adjacent to the inlet-side cell and in which only an end portion on an exhaust gas outflow side is open, the base further having a porous partition wall partitioning the inlet-side cell and the outlet-side cell; an inlet-side catalyst layer which is formed with a predetermined thickness on the inner side of the partition wall from the surface of the partition wall in contact with the inlet-side cell and which is formed with a predetermined length along an extension direction of the partition wall from the vicinity of the end portion on the exhaust gas inflow side, the inlet-side catalyst layer including an SCR catalyst consisting of a substance which adsorbs the reducing agent and purifies NOx in the exhaust gas; and an outlet-side catalyst layer which is formed with a predetermined thickness on the inner side of the partition wall from the surface of the partition wall in contact with the outlet-side cell and which is formed with a predetermined length along an extension direction of the partition wall from the vicinity of the end portion on the exhaust gas outflow side, the outlet-side catalyst layer including the SCR catalyst, wherein a sum of the length of the inlet-side catalyst layer and the length of the outlet-side catalyst layer in the extension direction is larger than the entire length of the partition wall in the extension direction, a thickness of the outlet-side catalyst layer is larger than a thickness of the inlet-side catalyst layer, the length of the outlet-side catalyst layer is larger than the length of the inlet-side catalyst layer in the extension direction, a total amount of the SCR catalyst present in the outlet-side catalyst layer is larger than a total amount of the SCR catalyst present in the inlet-side catalyst layer, an average pore diameter of a region where the inlet-side catalyst layer is formed, is 0.1 μm or more and 10 μm or less, wherein the average pore diameter is measured by performing a fine pore diameter measurement (bubble point method) based on gas permeation using a Palm Porometer, and an average pore diameter of a region where the outlet-side catalyst layer is formed, is 12 μm or more and 20 μm or less, wherein the average pore diameter is measured by performing a fine pore diameter measurement (bubble point method) based on gas permeation using a Palm Porometer. a base of a wall flow structure having an inlet-side cell in which only an end portion on an exhaust gas inflow side is open, an outlet-side cell which is adjacent to the inlet-side cell and in which only an end portion on an exhaust gas outflow side is open, the base further having a porous partition wall partitioning the inlet-side cell and the outlet-side cell; an inlet-side catalyst layer which is formed with a predetermined thickness on the inner side of the partition wall from the surface of the partition wall in contact with the inlet-side cell and which is formed with a predetermined length along an extension direction of the partition wall from the vicinity of the end portion on the exhaust gas inflow side, the inlet-side catalyst layer including an SCR catalyst consisting of a substance which adsorbs the reducing agent and purifies NOx in the exhaust gas; and an outlet-side catalyst layer which is formed with a predetermined thickness on the inner side of the partition wall from the surface of the partition wall in contact with the outlet-side cell and which is formed with a predetermined length along an extension direction of the partition wall from the vicinity of the end portion on the exhaust gas outflow side, the outlet-side catalyst layer including the SCR catalyst, wherein a sum of the length of the inlet-side catalyst layer and the length of the outlet-side catalyst layer in the extension direction is larger than the entire length of the partition wall in the extension direction, a thickness of the outlet-side catalyst layer is larger than a thickness of the inlet-side catalyst layer, the length of the outlet-side catalyst layer is larger than the length of the inlet-side catalyst layer in the extension direction, a total amount of the SCR catalyst present in the outlet-side catalyst layer is larger than a total amount of the SCR catalyst present in the inlet-side catalyst layer, an average pore diameter of a region where the inlet-side catalyst layer is formed, is 0.1 μm or more and 10 μm or less, wherein the average pore diameter is measured by performing a fine pore diameter measurement (bubble point method) based on gas permeation using a Palm Porometer, and an average pore diameter of a region where the outlet-side catalyst layer is formed, is 12 μm or more and 20 μm or less, wherein the average pore diameter is measured by performing a fine pore diameter measurement (bubble point method) based on gas permeation using a Palm Porometer.