An engine device for a work vehicle, the engine device configured to include a first case that removes particulate matter in exhaust gas of an engine and a second case that removes nitrogen oxides in the exhaust gas of the engine, and configured to mount the engine on a travelling vehicle-body frame on which right and left running wheels are arranged and to arrange an operation section that an operator gets on in a rear of a hood in which the engine is internally disposed comprising: structure in which the first case is supported on any of the engine or the travelling vehicle-body frame, and the second case is mounted on the travelling vehicle-body frame via support bodies, wherein the engine and the first case are internally disposed in an inside of the hood, and the first case is supported in a lateral posture on an upper surface side of the engine, and wherein the second case is supported in a longitudinal posture on one side of a rear portion of the engine, and wherein a urea water tank for exhaust gas purification and the second case are installed on a front surface of the operation section, and the second case is arranged on the one side of the rear portion of the engine, while the urea water tank is arranged on the other side of the rear portion of the engine, and wherein a fuel tank for supplying fuel to the engine is included, and an oil-feeding port of the fuel tank and a water-feeding port of the urea water tank are adjacently provided on a front portion of the operation section. structure in which the first case is supported on any of the engine or the travelling vehicle-body frame, and the second case is mounted on the travelling vehicle-body frame via support bodies, wherein the engine and the first case are internally disposed in an inside of the hood, and the first case is supported in a lateral posture on an upper surface side of the engine, and wherein the second case is supported in a longitudinal posture on one side of a rear portion of the engine, and wherein a urea water tank for exhaust gas purification and the second case are installed on a front surface of the operation section, and the second case is arranged on the one side of the rear portion of the engine, while the urea water tank is arranged on the other side of the rear portion of the engine, and wherein a fuel tank for supplying fuel to the engine is included, and an oil-feeding port of the fuel tank and a water-feeding port of the urea water tank are adjacently provided on a front portion of the operation section. wherein the engine and the first case are internally disposed in an inside of the hood, and the first case is supported in a lateral posture on an upper surface side of the engine, and wherein the second case is supported in a longitudinal posture on one side of a rear portion of the engine, and wherein a urea water tank for exhaust gas purification and the second case are installed on a front surface of the operation section, and the second case is arranged on the one side of the rear portion of the engine, while the urea water tank is arranged on the other side of the rear portion of the engine, and wherein a fuel tank for supplying fuel to the engine is included, and an oil-feeding port of the fuel tank and a water-feeding port of the urea water tank are adjacently provided on a front portion of the operation section.