It is a problem to provide an engine device for a work vehicle configured to miniaturize an engine room (hood) in which an engine 1 is internally disposed, thereby improving assembly workability or maintenance workability of respective cases 28 and 29 of which the external shape is formed in an oblong cylindrical shape. The engine device for a work vehicle is configured to include a first case 28 that removes particulate matter in exhaust gas of an engine 1 and a second case 29 that removes nitrogen oxides in the exhaust gas of the engine 1 and configured to mount the engine 1 on a travelling vehicle-body frame 120 on which right and left running wheels 53 and 54 are arranged, and the engine device has structure in which the first case 28 is supported on the engine 1, and the second case 29 is mounted on the travelling vehicle-body frame 120 via support bodies 121.