Estimation apparatus and estimation method

An estimation apparatus that estimates a degradation amount of an energy storage device, the estimation apparatus comprising:

• a storage unit;
• and
• an arithmetic processing unit,
• wherein
• the energy storage device has a characteristic of including a first degradation area in which a temporal transition of a degradation amount shows a first transition and a second degradation area in which the temporal transition of the degradation amount shows a second transition,
• the storage unit holds
• first arithmetic data for calculating the degradation amount of the energy storage device in the first degradation area, and
• second arithmetic data for calculating the degradation amount of the energy storage device in the second degradation area, and
• the arithmetic processing unit executes
• determination processing of determining a degradation area of the energy storage device, and
• estimation processing of selecting arithmetic data corresponding to the degradation area from the storage unit to estimate the degradation amount of the energy storage device.