Provided is an engine device that facilitates fastening between a main machine frame (140) and a side surface of an exhaust gas purification case (38) so that workability of mounting the exhaust gas purification ease (38) can be easily improved. The engine device is provided with the exhaust gas purification case (38) for processing exhaust gas from an engine (1), and the exhaust gas purification ease (38) is disposed on a main machine (120) side on which the engine (1) is mounted. The engine device is provided with the main machine frame (140) on which the engine (1) and the like are mounted. The main machine frame (140) is provided with a bottom support member (141) for supporting the exhaust gas purification case (38) and side support devices (143, 144) for fastening and fixing the exhaust gas purification case (38) to the main machine frame (140) in an attachable and detachable manner.