Construction machine

A construction machine comprising:

• a machine body;
• a work attachment that is mounted to the machine body, includes a bucket capable of excavating and holding earth constituting ground, and is capable of executing an excavation operation of the ground through the bucket;
• a weight detection unit that is capable of detecting a weight of the earth held by the bucket;
• and
• a hardness estimation unit that estimates hardness of the ground,
• wherein the hardness estimation unit is configured to execute estimation processing of estimating hardness of the ground based on a weight of the earth detected by the weight detection unit and first hardness correspondence data defining a change in weight of the earth due to a difference in hardness of the ground after execution of a predetermined excavation operation in which the work attachment changes its posture while satisfying a target speed condition from an excavation start posture to an excavation completion posture capable of holding earth after excavation.