Work machine

A work machine which performs an excavation task of excavating soil and sand of ground on a work site by a bucket to hold the excavated soil and sand by the bucket, and a discharge task of discharging the excavated soil and sand from the bucket at a position above a loading destination, the work machine comprising:

• a machine body;
• a working device which includes a boom supported on the machine body tiltably in a rising direction and a lowering direction, and the bucket for excavating the soil and sand in the excavation task;
• a posture acquisition section including a posture detector and configured to acquire a posture of the working device;
• a load acquisition section including a sensor and configured to acquire a load of the soil and sand held by the bucket;
• an input manipulation receipt part including a switch configured to receive an input manipulation by an operator;
• and
• a controller configured to
• set a reference posture which is one of postures of the working device in the excavation task, the reference posture being a posture of the working device acquired after the switch receives the input manipulation;
• determine that the working device has moved to a height level where the discharge task is to be performed based on a posture change amount being equal to or larger than a predetermined change amount threshold for determination of an estimative load of the soil and sand estimated to be discharged at the position above the loading destination in the discharge task, the posture change amount representing a changed degree of the posture of the working device from the reference posture;
• determine, based on the load acquired by the load acquisition section, the estimative load when a predetermined estimative load determinative criterion is satisfied, the predetermined estimative load determinative criterion including a first criterion that the posture change amount is equal to or larger than the predetermined change amount threshold;
• and
• output an estimative result which is information about the estimative load determined by the controller.