A drive unit (10, 82) for a hybrid vehicle, in which a prime mover includes an engine, a first motor, and a second motor, and in which a driving force generated by the prime mover is transmitted to an output member connected to a driving wheel, comprising: a first differential unit including a first rotary element to which the engine is connected, a second rotary element to which the first motor is connected, and a third rotary element; a second differential unit including a fourth rotary element to which the output member is connected, a fifth rotary element connected to the third rotary element, and a sixth rotary element; a first engagement device that is engaged to selectively connect any two of the fourth rotary element, the fifth rotary element, and the sixth rotary element; and a second engagement device is engaged to selectively connect the first rotary element or the second rotary element to the sixth rotary element, wherein the second motor is connected to the output member, wherein a first mode in which a speed ratio between the engine and the output member becomes a first ratio (γ2) smaller than "1" is configured to be established by engaging any one of the first engagement device and the second engagement device while disengaging the other engagement device, wherein the first mode includes a state in which power of the engine is configured to be transmitted to the output member by reducing a speed of the first motor to zero and in which a first mechanical point is at the first ratio, wherein a second mode in which the speed ratio becomes a second ratio (γ1) larger than "1" is configured to be established by engaging said other engagement device while disengaging said one of engagement devices, wherein the second mode includes a state in which the power of the engine is configured to be transmitted to the output member by reducing a speed of the first motor to zero and in which a second mechanical point is at the second ratio (γ1), and wherein a state in which the speed ratio becomes "1" is configured to be established by engaging both of the first engagement device and the second engagement device. a first differential unit including a first rotary element to which the engine is connected, a second rotary element to which the first motor is connected, and a third rotary element; a second differential unit including a fourth rotary element to which the output member is connected, a fifth rotary element connected to the third rotary element, and a sixth rotary element; a first engagement device that is engaged to selectively connect any two of the fourth rotary element, the fifth rotary element, and the sixth rotary element; and a second engagement device is engaged to selectively connect the first rotary element or the second rotary element to the sixth rotary element, wherein the second motor is connected to the output member, wherein a first mode in which a speed ratio between the engine and the output member becomes a first ratio (γ2) smaller than "1" is configured to be established by engaging any one of the first engagement device and the second engagement device while disengaging the other engagement device, wherein the first mode includes a state in which power of the engine is configured to be transmitted to the output member by reducing a speed of the first motor to zero and in which a first mechanical point is at the first ratio, wherein a second mode in which the speed ratio becomes a second ratio (γ1) larger than "1" is configured to be established by engaging said other engagement device while disengaging said one of engagement devices, wherein the second mode includes a state in which the power of the engine is configured to be transmitted to the output member by reducing a speed of the first motor to zero and in which a second mechanical point is at the second ratio (γ1), and wherein a state in which the speed ratio becomes "1" is configured to be established by engaging both of the first engagement device and the second engagement device.