An exhaust gas purifying device comprising: a honeycomb catalyst including a first honeycomb base material having porous partition walls arranged to form a plurality of cells which extend through the first honeycomb base material from a first inflow side end face to a first outflow side end face and provide a plurality of through channels for a fluid, and a three way catalyst loaded onto the first honeycomb base material, the cells having both ends open; a plugged honeycomb structure including a second honeycomb base material having porous partition walls arranged to form a plurality of cells which extend through the second honeycomb base material from a second inflow side end face to a second outflow side end face and provide through channels for the fluid, and plugged portions arranged to plug open frontal areas of predetermined cells in the second outflow side end face of the second honeycomb base material and open frontal areas of the remaining cells in the second inflow side end face of the second honeycomb base material; and a can member containing the honeycomb catalyst and the plugged honeycomb structure and having an inflow port through which an exhaust gas flows into the can member and an outflow port through which the purified exhaust gas flows out of the can member, wherein the honeycomb catalyst is disposed in the can member on an inflow port side thereof so that the first inflow side end face faces the inflow port side of the can member, the plugged honeycomb structure is disposed in the can member on an outflow port side thereof so that the second outflow side end face faces the outflow port side of the can member, the value of a ratio of a length of the honeycomb catalyst along a central axis direction with respect to a length of the plugged honeycomb structure along the central axis direction is from 0.1 to 0.5, either no catalyst is loaded onto the plugged honeycomb structure, or a catalyst is loaded onto the plugged honeycomb structure and the amount of the catalyst loaded per unit volume of the plugged honeycomb structure is smaller than the amount of the three way catalyst loaded per unit volume of the honeycomb catalyst, the cell density of the first honeycomb base material is larger than that of the second honeycomb base material, the open area ratio in the first inflow side end face of the honeycomb catalyst is larger than that in the second inflow side end face of the plugged honeycomb structure, and the diameter of the honeycomb catalyst is equal to or smaller than that of the plugged honeycomb structure. a honeycomb catalyst including a first honeycomb base material having porous partition walls arranged to form a plurality of cells which extend through the first honeycomb base material from a first inflow side end face to a first outflow side end face and provide a plurality of through channels for a fluid, and a three way catalyst loaded onto the first honeycomb base material, the cells having both ends open; a plugged honeycomb structure including a second honeycomb base material having porous partition walls arranged to form a plurality of cells which extend through the second honeycomb base material from a second inflow side end face to a second outflow side end face and provide through channels for the fluid, and plugged portions arranged to plug open frontal areas of predetermined cells in the second outflow side end face of the second honeycomb base material and open frontal areas of the remaining cells in the second inflow side end face of the second honeycomb base material; and a can member containing the honeycomb catalyst and the plugged honeycomb structure and having an inflow port through which an exhaust gas flows into the can member and an outflow port through which the purified exhaust gas flows out of the can member, wherein the honeycomb catalyst is disposed in the can member on an inflow port side thereof so that the first inflow side end face faces the inflow port side of the can member, the plugged honeycomb structure is disposed in the can member on an outflow port side thereof so that the second outflow side end face faces the outflow port side of the can member, the value of a ratio of a length of the honeycomb catalyst along a central axis direction with respect to a length of the plugged honeycomb structure along the central axis direction is from 0.1 to 0.5, either no catalyst is loaded onto the plugged honeycomb structure, or a catalyst is loaded onto the plugged honeycomb structure and the amount of the catalyst loaded per unit volume of the plugged honeycomb structure is smaller than the amount of the three way catalyst loaded per unit volume of the honeycomb catalyst, the cell density of the first honeycomb base material is larger than that of the second honeycomb base material, the open area ratio in the first inflow side end face of the honeycomb catalyst is larger than that in the second inflow side end face of the plugged honeycomb structure, and the diameter of the honeycomb catalyst is equal to or smaller than that of the plugged honeycomb structure.