A hybrid vehicle comprising: an internal combustion engine and a motor which are power sources when the vehicle travels; and a brake booster device that increases an operation force when a brake pedal is operated making use of a negative pressure generated when the internal combustion engine is operated, characterized in that: when a booster pressure which is the negative pressure used by the brake booster device is higher than a first determination value which is a predetermined determination value while the vehicle travels only by a power generated by the motor, a negative pressure generation control which is a control for generating the negative pressure is executed by operating the internal combustion engine by the power generated by the motor, characterised in that when the negative pressure generation control is executed, when the booster pressure is lower than a second determination value which is a determination value higher than the first determination value, the internal combustion engine is operated only when the brake pedal is not depressed, and when the booster pressure is equal to or higher than the second determination value, the internal combustion engine is operated when the brake pedal is not depressed and when the brake pedal in the depressed state is returned. an internal combustion engine and a motor which are power sources when the vehicle travels; and a brake booster device that increases an operation force when a brake pedal is operated making use of a negative pressure generated when the internal combustion engine is operated, characterized in that: when a booster pressure which is the negative pressure used by the brake booster device is higher than a first determination value which is a predetermined determination value while the vehicle travels only by a power generated by the motor, a negative pressure generation control which is a control for generating the negative pressure is executed by operating the internal combustion engine by the power generated by the motor, characterised in that when the negative pressure generation control is executed, when the booster pressure is lower than a second determination value which is a determination value higher than the first determination value, the internal combustion engine is operated only when the brake pedal is not depressed, and when the booster pressure is equal to or higher than the second determination value, the internal combustion engine is operated when the brake pedal is not depressed and when the brake pedal in the depressed state is returned. when a booster pressure which is the negative pressure used by the brake booster device is higher than a first determination value which is a predetermined determination value while the vehicle travels only by a power generated by the motor, a negative pressure generation control which is a control for generating the negative pressure is executed by operating the internal combustion engine by the power generated by the motor, characterised in that when the negative pressure generation control is executed, when the booster pressure is lower than a second determination value which is a determination value higher than the first determination value, the internal combustion engine is operated only when the brake pedal is not depressed, and when the booster pressure is equal to or higher than the second determination value, the internal combustion engine is operated when the brake pedal is not depressed and when the brake pedal in the depressed state is returned.