A mechanism and the like configured to reduce a shock involved in the connection of the engine is made no longer necessary for a hybrid vehicle, and an increase in the number of parts of the hybrid vehicle is inhibited. A clutch is connected between an electric motor and an engine in a case where a difference between a current engine speed and a target engine speed is not greater than a first predetermined value. The absolute value of a difference between the current engine speed and a moving average value of the engine speed at intervals of a predetermined length of time is not greater than a second predetermined value which is used for a settling judgment. The engine speed shows a predetermined inclination representing a decreasing trend.