| 摘要 |
[PROBLEM] To provide a construction machine capable of performing necessary operation or operations without a difficulty even when a remaining amount of a reducing agent becomes small. [SOLUTION] In a hydraulic excavator having an engine, a hydraulic cylinder (18), plural actuators including a hydraulic motor (29), and an exhaust gas treatment system for subjecting, to purification treatment, nitrogen oxides in exhaust gas from the engine, the hydraulic excavator is provided with an actuator operation control means for performing, when the remaining amount of the reducing agent in a reducing agent storage tank (30) is detected by a remaining reducing-agent amount detector (33) to have become equal to or smaller than a predetermined remaining amount, limiting control to limit an operation of the hydraulic cylinder (18) such that a front working implement driven by the hydraulic cylinder (18) becomes difficult to exhibit its function, and at a same time, holding control for holding the hydraulic motor (20) operable such that a function of a travel base (1) or swing upperstructure (3) driven by the hydraulic motor (20) can be exhibited.
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