To provide an engine measurement device for determining the mechanical loss of an engine for a short time. The engine measurement device includes a detector (2) for measuring the individual pieces oftime series data containing at least the speed and the output torque of an engine (10) in a transient state while the engine (10) being run in combustion by the control of an engine control unit (3),a torque operation unit (64) for calculating the engine torque on the basis of the time series data of the engine speed and the output torque, and a model operation unit (66) for modeling the engine torque as functions of the engine speed and a fuel injection time. This model is used to calculate both a fuel torque generated by the combustion run of the engine and a mechanical loss torque or the difference between the engine torque and the fuel torque.