PROBLEM TO BE SOLVED: To provide an exhaust gas posttreatment device of an internal combustion engine which can facilitate incinerating and regenerating a filter for collecting a particulate, etc., and which can be simplified. SOLUTION: The exhaust gas posttreatment device of the internal combustion engine includes a filter casing 4 having the filter 6 interposed between a casing inlet 402 and a casing outlet 403, a first hole group H1 having a plurality of inlet holes 11 for guiding an exhaust gas in a first direction, a second hole group H2 formed in the filter in a state which does not interfere with the first group and having a plurality of outlet holes 12 for guiding the exhaust gas in a direction different from the first direction, a transmission passage r1 which can transmit the exhaust gas flowing from the inlet 402 to the holes 11 through a wall (w) between the inlet and the outlet and which can flow out to the outlet 403, a bypass passage r2 for exhausting the gas to the outlet c2 from the inlet c1 of the inlet hole from the outlet via a bypass tube 406, and a controller 8 for controlling a control valve 7 in response to an exhaust pressure pg or a filter temperature. COPYRIGHT: (C)2004,JPO