Work vehicle and combine harvester

The invention provides a work vehicle and a combine harvester. A work vehicle (A) is provided with an engine (6), an engine output shaft (35) as an output shaft of the engine (6), a bearing housing (44) that holds a bearing (45) and covers at least a part of the engine output shaft (35), and an exhaust gas treatment device (33) that purifies exhaust gas discharged from the engine (6), and the engine output shaft (35) is supported by the bearing housing (44) via the bearing (45). An output rotating body (50) that rotates integrally with the engine output shaft (35) is attached to a portion of the engine output shaft (35) on the opposite side from the engine (6) with respect to the bearing (45), the engine output shaft (35) has a device support section (7) supported by the bearing housing (44), and the exhaust treatment device (33) is supported by the device support section (7). 本发明提供一种作业车辆以及联合收割机。作业车辆(A)具有：发动机(6)、作为发动机(6)的输出轴的发动机输出轴(35)、保持轴承(45)且覆盖发动机输出轴(35)的至少一部分的轴承箱(44)、以及对从发动机(6)排出的排气进行净化处理的排气处理装置(33)，发动机输出