Electric tool system, diagnosis method, and program

An electric tool system comprising

• an electric tool section,
• a measuring unit,
• a storage unit, and
• an estimation unit,
• the electric tool section including:
• a driving part configured to be supplied with motive power by a power source and thereby generate torque;
• an attachment part to which a tip tool is attachable;
• and
• a transmission part configured to transmit the torque from the driving part to the attachment part and thereby drive the attachment part,
• the measuring unit being configured to measure a physical quantity concerning the electric tool section,
• the storage unit being configured to store a failure diagnostic value in association with time information about a point in time when the physical quantity is measured, the failure diagnostic value being at least one of the physical quantity measured by the measuring unit or an arithmetic value calculated based on the physical quantity, and
• the estimation unit being configured to obtain, based on the failure diagnostic value and the time information that are stored in the storage unit, expected lifetime information about an estimated amount of time that is expected to take for the electric tool section to cause any failure.