[Problem] The present invention provides a combine that can easily supply a urea aqueous solution to a urea tank while ensuring a storage capacity of a grain silo. [Solution] The combine is provided with an exhaust purification device (20) for purifying exhaust gas of the engine (E), and the exhaust purification device (20) includes an oxidation catalyst (21), Oxidizing unburned gas in the exhaust gas exhausted from the engine (E)； and a selective reduction catalyst (22), which uses ammonia generated from urea water to exhaust gas after passing through the oxidation catalyst (21) The nitrogen oxides in the gas are reduced for purification, and the combine is provided with a urea water tank (25) storing urea water supplied to the selective reduction catalyst (22), and the urea water tank (25) is arranged in a grain silo (7 The water supply port (25A) of the urea water tank (25) is arranged on the rear side of the rear wall and outside the body of the valley portion (8A) toward the rear of the body.[課題] 本發明提供一種聯合收割機，能夠確保穀物倉的貯存容量並且向尿素水箱容易地補給尿素水溶液。[解決手段] 該聯合收割機設置有對所述發動機（E）的排氣氣體進行淨化的排氣淨化裝置（20），在排氣淨化裝置（20）中具有：氧化催化劑（21），其對從發動機（E）排出的排氣氣體中的未燃燒氣體進行氧化；以及選擇性還原觸媒（22），其利用由尿素水所產生的氨對通過了氧化催化劑（21）之後的排氣氣體中的氮氧化物進行還原從而進行淨化，該聯合收割機設置有貯存向選擇性還原觸媒（22）供給的尿素水的尿素水箱（25），尿素水箱（25）配置在穀物倉（7）的後壁的後側且揚穀部（8A）的機體外側的部位，尿素水箱（25）的供水口（25A）朝向機體後方配置。
