A torque measuring device for an engine, comprising: a loading means for applying a load to the engine having a plurality of cylinders; an output torque detecting means for detecting as a signal an output torque of the engine to which the load is applied; a rotating member rotation angle detecting means for detecting a rotation angle of a rotating member to which a piston of each cylinder in the engine is connected; characterized in that the torque measuring device comprises: a top mark detecting means for detecting a top dead center or a bottom dead center of the piston of each cylinder; and a torque predicting means for predicting a torque characteristic of each cylinder based on the signal of the output torque detected by the output torque detecting means, the rotation angle of the rotating member detected by the rotating member rotation angle detecting means, the top dead center or the bottom dead center of the piston of each cylinder detected by the top mark detecting means, and the number of cylinders and the number of cycles of the engine; wherein the torque predicting means predicts as the torque characteristic of each cylinder at least either a peak torque of each cylinder or a corresponding combustion angle by which the peak torque is attained. a loading means for applying a load to the engine having a plurality of cylinders; an output torque detecting means for detecting as a signal an output torque of the engine to which the load is applied; a rotating member rotation angle detecting means for detecting a rotation angle of a rotating member to which a piston of each cylinder in the engine is connected; characterized in that the torque measuring device comprises: a top mark detecting means for detecting a top dead center or a bottom dead center of the piston of each cylinder; and a torque predicting means for predicting a torque characteristic of each cylinder based on the signal of the output torque detected by the output torque detecting means, the rotation angle of the rotating member detected by the rotating member rotation angle detecting means, the top dead center or the bottom dead center of the piston of each cylinder detected by the top mark detecting means, and the number of cylinders and the number of cycles of the engine; wherein the torque predicting means predicts as the torque characteristic of each cylinder at least either a peak torque of each cylinder or a corresponding combustion angle by which the peak torque is attained. a top mark detecting means for detecting a top dead center or a bottom dead center of the piston of each cylinder; and a torque predicting means for predicting a torque characteristic of each cylinder based on the signal of the output torque detected by the output torque detecting means, the rotation angle of the rotating member detected by the rotating member rotation angle detecting means, the top dead center or the bottom dead center of the piston of each cylinder detected by the top mark detecting means, and the number of cylinders and the number of cycles of the engine; wherein the torque predicting means predicts as the torque characteristic of each cylinder at least either a peak torque of each cylinder or a corresponding combustion angle by which the peak torque is attained.