A catalytic converter, characterized in that the catalytic converter has: a first casing; a first honeycomb carrier having multiple first metal sheets and a first catalyst layer, the first metal sheets disposed in the first casing and connected with each other to form multiple first channels in the first casing, the first catalyst layer formed on the surfaces of the first metal sheets, and a material of the first catalyst layer including platinum, palladium, and rhodium; multiple second casings connected to the first casing; and multiple second honeycomb carriers each respectively disposed in the second casings, each one of the second honeycomb carriers having: multiple second metal sheets and a second catalyst layer, the second metal sheets disposed in the second casings and connected with each other to form multiple second channels in said corresponding second casing, the second catalyst layer formed on the surfaces of the second metal sheets, and a material of the second catalyst layer including platinum, palladium, and rhodium, the catalytic converter being characterized in that the amount of rhodium in the first catalyst layer is more than the amount of platinum or the amount of palladium in the first catalyst layer and in that the amount of palladium in each one of the second catalyst layers is more than the amount of platinum or the amount of rhodium in each one of the second catalyst layers. a first casing; a first honeycomb carrier having multiple first metal sheets and a first catalyst layer, the first metal sheets disposed in the first casing and connected with each other to form multiple first channels in the first casing, the first catalyst layer formed on the surfaces of the first metal sheets, and a material of the first catalyst layer including platinum, palladium, and rhodium; multiple second casings connected to the first casing; and multiple second honeycomb carriers each respectively disposed in the second casings, each one of the second honeycomb carriers having: multiple second metal sheets and a second catalyst layer, the second metal sheets disposed in the second casings and connected with each other to form multiple second channels in said corresponding second casing, the second catalyst layer formed on the surfaces of the second metal sheets, and a material of the second catalyst layer including platinum, palladium, and rhodium, the catalytic converter being characterized in that the amount of rhodium in the first catalyst layer is more than the amount of platinum or the amount of palladium in the first catalyst layer and in that the amount of palladium in each one of the second catalyst layers is more than the amount of platinum or the amount of rhodium in each one of the second catalyst layers. multiple second metal sheets and a second catalyst layer, the second metal sheets disposed in the second casings and connected with each other to form multiple second channels in said corresponding second casing, the second catalyst layer formed on the surfaces of the second metal sheets, and a material of the second catalyst layer including platinum, palladium, and rhodium, the catalytic converter being characterized in that the amount of rhodium in the first catalyst layer is more than the amount of platinum or the amount of palladium in the first catalyst layer and in that the amount of palladium in each one of the second catalyst layers is more than the amount of platinum or the amount of rhodium in each one of the second catalyst layers.