A motor failure diagnosis system includes: a motor having a rotating shaft and a bearing that receives the rotating shaft; a vibration sensor capable of detecting a vibration of the motor when the rotating shaft is a rotation state; the date information output unit capable of outputting date information; a vibration information storage unit that stores the vibration information detected by the vibration sensor and the date information output by the date information output unit in correlation; and a failure date identifying unit that identifies the date on which a failure occurred in the bearing of the motor on the basis of the vibration information and the date information stored in the vibration information storage unit.