A vehicle includes a first detecting means for detecting an engine speed, a second detecting means for detecting a rotational speed of a rotating member, an engine speed changing means for changing the engine speed, and a control unit. The control unit is electrically connected to the first detecting means, the second detecting means, and the engine speed changing means and controls the engine speed changing means when the rotational speed of the rotating member detected by the second detecting means is lower than a set rotational speed previously set in a range from zero to a rotational speed of the rotating member during rotation of the engine in a range between a speed more than an idle rotational speed and a speed less than a predetermined maximum limit rotational speed.