An engine output control device for controlling engine output at a time of a downshift speed change of a transmission , the engine output control device comprising: engine speed detecting means (SE3) for detecting an actual engine speed (NeJ) of a crankshaft ; and engine output adjusting means capable of adjusting the engine output according to an operation of a rider; characterized in that the engine output control device i) calculates a target engine speed (NeT) from a vehicle speed at the time of the speed change operation and a speed change ratio of a speed change stage after a downshift, ii) determines the requested engine output (PA) according to a difference between the target engine speed (NeT) and the actual engine speed (NeJ), and iii) outputs the smaller of the requested engine output (PA) and a rider requested engine output (PB) adjusted by the engine output adjusting means as the engine output, the engine output control device calculates an engine speed after speed change operation (NeB) from a vehicle speed at the time of the speed change operation and a speed change ratio of a speed change stage after a downshift, when the actual engine speed (NeJ) overshoots the engine speed after speed change operation (NeB) after relative rotation due to power transmission between a pair of speed change gears included in the transmission is ceased and the speed change is completed, the engine output control device calculates a subtractive engine output (PC) from an overshoot amount (NeD) of the actual engine speed (NeJ), and outputs an engine output (PB - PC) obtained by subtracting the subtractive engine output (PC) from the rider requested engine output (PB). engine speed detecting means (SE3) for detecting an actual engine speed (NeJ) of a crankshaft ; and engine output adjusting means capable of adjusting the engine output according to an operation of a rider; characterized in that the engine output control device i) calculates a target engine speed (NeT) from a vehicle speed at the time of the speed change operation and a speed change ratio of a speed change stage after a downshift, ii) determines the requested engine output (PA) according to a difference between the target engine speed (NeT) and the actual engine speed (NeJ), and iii) outputs the smaller of the requested engine output (PA) and a rider requested engine output (PB) adjusted by the engine output adjusting means as the engine output, the engine output control device calculates an engine speed after speed change operation (NeB) from a vehicle speed at the time of the speed change operation and a speed change ratio of a speed change stage after a downshift, when the actual engine speed (NeJ) overshoots the engine speed after speed change operation (NeB) after relative rotation due to power transmission between a pair of speed change gears included in the transmission is ceased and the speed change is completed, the engine output control device calculates a subtractive engine output (PC) from an overshoot amount (NeD) of the actual engine speed (NeJ), and outputs an engine output (PB - PC) obtained by subtracting the subtractive engine output (PC) from the rider requested engine output (PB). <EOS>