Behavior estimation device and behavior estimation method for saddle-type vehicle

A behavior estimation device configured to analyze a behavior of a saddle-type vehicle including a vehicle body, a drive source, an operating element configured to receive an operation of a driver, and a grounded traveling body configured to travel using a driving force generated by the drive source, the behavior estimation device comprising:

• a receiving device configured to receive an output instruction value of the drive source which changes in accordance with an operation amount of the operating element and a rotational speed of the drive source, the output instruction value and the rotational speed being detected by a sensor provided in the saddle-type vehicle during traveling of the saddle-type vehicle;
• and
• a processing device configured to estimate whether the grounded traveling body is in a grounded state in which the grounded traveling body is in contact with a road surface or in a jump state in which the grounded traveling body is separated from the road surface based on the output instruction value and the rotational speed received by the receiving device, wherein
• the processing device is configured to:
• calculate a temporal change of the output instruction value;
• and
• estimate whether the grounded traveling body is in the grounded state or in the jump state based on determination that the temporal change is a characteristic temporal change occurring before and after a jump of the saddle-type vehicle.