Construction machine

A construction machine including a hydraulic system having a hydraulic pump, and a first hydraulic actuator and a second hydraulic actuator which are driven by hydraulic oil supplied from the hydraulic pump, the construction machine comprising:

• a first flow rate detector that detects a flow rate of drain hydraulic oil discharged from the first hydraulic actuator;
• a second flow rate detector that detects a flow rate of drain hydraulic oil discharged from the second hydraulic actuator;
• and
• an abnormality determination unit that determines abnormality of the first hydraulic actuator, based on a detection signal from the first flow rate detector, and determines abnormality of the second hydraulic actuator, based on a detection signal from the second flow rate detector,
• wherein the first flow rate detector and the second flow rate detector each have a moving body disposed inside a flow path of the drain hydraulic oil and biased in a direction of blocking a flow of the drain hydraulic oil, and an output unit that outputs a detection signal according to a movement amount of the moving body.