PROBLEM TO BE SOLVED: To provide a combine harvester maintaining high combustion efficiency of an engine, and including a DPF unit having a grain tank of large storage capacity.SOLUTION: A base part of a tail pipe (61, 71, 81) of a DPF unit (40) is extended upward along an inclined wall (23B), and the distal end of the tail pipe (61, 71, 81) is disposed above a grain tank (6).