To make the operating state of an engine determinable by integrating the number of revolutions of the engine.

An engine speed integrating meter is provided with a number-of-revolution measuring means 2, which measures the number of revolutions of the engine 1 and a number-of-revolution integrating means 5 which integrates the number of revolutions measured by means of the measuring means 2 for each set number-of-revolution region. The meter causes a displaying means 8 to display the integrated value of the number of revolutions integrated by means of the integrating means 5 for each number-of-revolution region.