ABNORMALITY DIAGNOSIS SYSTEM

An abnormality diagnosis system (120) configured to diagnose an abnormality of an electric drive system (10) mounted on a mobile body (20) to drive a motor (11) for moving the mobile body includes: an information acquisition unit (121) configured to acquire a motor output information which is information related to an output state of the motor; an output state determination unit (122) configured to determine whether the output state of the motor is in a low output state that does not contribute to a movement of the mobile body by using the motor output information; and a diagnosis execution unit (123) configured to diagnose an abnormality of the electric drive system when it is determined that the motor is in the low output state.