TORQUE MONITORING DEVICE

A torque monitoring device monitors the occurrence of an abnormal torque state causing an estimated torque as an estimated value for an actual torque of an internal combustion engine to differ from an engine-requested torque required of the internal combustion engine and includes: a discrete value setup unit configured to increase a discrete value correspondingly to increase in a difference quantity between the estimated torque and the engine-requested torque; an accumulation unit configured calculate an accumulation value of the discrete value; and a determination unit configured to determine that the abnormal torque state occurs when the accumulation value becomes larger than or equal to a predetermined abnormality determination threshold value.