The present invention provides a combine capable of compactly integrating an oxidation catalyst and a selective catalytic reduction catalyst, so as to reduce the space in which the oxidation catalyst and the selective catalytic reduction catalyst are arranged. The oxidation catalyst (21) is arranged in a posture such that the exhaust gas flows along the up-down direction. The selective catalytic reduction catalyst (22) is arranged in a posture such that the exhaust gas flows along the front-rear direction. One of the left side and the right side of the oxidation catalyst (21) is provided with a first supporting portion member (52) along the up-down direction so as to support the oxidation catalyst (21). The rear of the first supporting portion member (52) is arranged to be behind the front of the first supporting portion member (52) and to shift toward one of the left side and the right side. An opening portion (53) is formed at the lower portion of the first supporting portion member (52), such that the portion of one of the left side and the right side of the front of the selective catalytic reduction catalyst (22) may enter the opening portion (3).本發明提供聯合收割機，使氧化催化劑和選擇性還原觸媒催化劑緊湊地一體化，從而能夠減小配置氧化催化劑和選擇性還原觸媒催化劑的空間。以使廢氣流通方向沿著上下方向的姿態設置氧化催化劑（21），以使廢氣流通方向沿著前後方向的姿態設置選擇性還原觸媒催化劑（22），在氧化催化劑（21）的左右側中的一側設置對氧化催化劑（21）進行支承的沿上下方向的第一支承部件（52），將第一支承部件（52）的後部配置在比第一支承部件（52）的前部靠後方並且向左右側中的一側偏移的位置，在第一支承部件（52）的下部形成開口部（53），使選擇性還原觸媒催化劑（22）的前部的左右側中的一側的部位進入開口部（3）內。
