The present invention addresses the problem of providing an engine device to be mounted on a working
machine, said engine device being constructed such that a support structure for multiple or a single
exhaust gas purification case (75, 151) and the like can be simplified, and the multiple or single
exhaust gas purification case (75, 151) can be easily attached to a working vehicle such as an agricultural
machine or a construction
machine. In this engine device to be mounted on a working machine, multiple or a single
exhaust gas purification case (75, 151) for treating the exhaust gas of a
diesel engine (14) is provided, and an exhaust gas inlet port of the exhaust gas purification case (75, 151) is connected to an
exhaust pipe (119) of the
diesel engine (14). The engine device is constructed such that an engine compartment frame (91) is provided on a traveling machine body (1), an engine compartment (97) is formed by the engine compartment frame (91), and the
diesel engine (14) is installed inside the engine compartment (97), and is equipped with an exhaust gas purification unit frame (114) that secures the multiple or single exhaust gas purification case (75, 151) as one unit, said exhaust gas purification unit frame (114) being detachably mounted either on the diesel engine (14) or on the engine compartment frame (91).