A vehicle drive system including: a motor (2A, 2B) that drives a wheel (LWr, RWr); a speed changer (12A, 12B) that is provided on a power transmission line between the motor (2A, 2B) and the wheel (LWr, RWr); and a case that accommodates the motor (2A, 2B) and the speed changer (12A, 12B), wherein the motor (2A, 2B) includes a first and a second motor (2A, 2B) that are disposed left and right in a width direction of a vehicle, wherein the speed changer (12A, 12B) includes a first and a second speed changer (12A, 12B) that are disposed left and right in the width direction of the vehicle, wherein the first motor and the first speed changer are disposed sequentially in this order from an outer side in the width direction of the vehicle, and the second motor and the second speed changer are disposed sequentially in this order from an outer side in the width direction of the vehicle, whereby the first and second speed changers (12A, 12B) are disposed between the first and second motors (2A, 2B), wherein the first and second motors (2A, 2B) and the first and second speed changers (12A, 12B) are disposed coaxially, wherein at least part of a radially outer edge of a rotational element of the first speed changer or a radially outer edge of a rotational element of the second speed changer is formed smaller than a smaller one of a radially outermost edge portion of the first motor and a radially outermost edge portion of the second motor, wherein an offset space that is recessed further radially than an imaginary line that connects the radially outermost edge portion of the first motor with the radially outermost edge portion of the second motor is provided radially outwards of the rotational element of the first speed changer or the rotational element of the second speed changer, and characterized in that at least part of a volumetric capacity room that communicates with an interior of the case is disposed within the offset space, and wherein the volumetric capacity room includes at least one of a breather chamber that makes up a breather unit and which restrains a liquid fluid that is used to lubricate and/or cool at least one of the motor (2A, 2B) and the power transmission line by circulating within the case from flowing out to the outside thereof, and a central volumetric capacity room that makes up a lateral communication path that establishes a communication between a left reservoir portion that reserves a liquid fluid that is used to lubricate and/or cool at least one of the first motor and the power transmission line and a right reservoir portion that reserves a liquid fluid that is used to lubricate and/or cool at least one of the second motor and the power transmission line. a motor (2A, 2B) that drives a wheel (LWr, RWr); a speed changer (12A, 12B) that is provided on a power transmission line between the motor (2A, 2B) and the wheel (LWr, RWr); and a case that accommodates the motor (2A, 2B) and the speed changer (12A, 12B), wherein the motor (2A, 2B) includes a first and a second motor (2A, 2B) that are disposed left and right in a width direction of a vehicle, wherein the speed changer (12A, 12B) includes a first and a second speed changer (12A, 12B) that are disposed left and right in the width direction of the vehicle, wherein the first motor and the first speed changer are disposed sequentially in this order from an outer side in the width direction of the vehicle, and the second motor and the second speed changer are disposed sequentially in this order from an outer side in the width direction of the vehicle, whereby the first and second speed changers (12A, 12B) are disposed between the first and second motors (2A, 2B), wherein the first and second motors (2A, 2B) and the first and second speed changers (12A, 12B) are disposed coaxially, wherein at least part of a radially outer edge of a rotational element of the first speed changer or a radially outer edge of a rotational element of the second speed changer is formed smaller than a smaller one of a radially outermost edge portion of the first motor and a radially outermost edge portion of the second motor, wherein an offset space that is recessed further radially than an imaginary line that connects the radially outermost edge portion of the first motor with the radially outermost edge portion of the second motor is provided radially outwards of the rotational element of the first speed changer or the rotational element of the second speed changer, and characterized in that at least part of a volumetric capacity room that communicates with an interior of the case is disposed within the offset space, and wherein the volumetric capacity room includes at least one of a breather chamber that makes up a breather unit and which restrains a liquid fluid that is used to lubricate and/or cool at least one of the motor (2A, 2B) and the power transmission line by circulating within the case from flowing out to the outside thereof, and a central volumetric capacity room that makes up a lateral communication path that establishes a communication between a left reservoir portion that reserves a liquid fluid that is used to lubricate and/or cool at least one of the first motor and the power transmission line and a right reservoir portion that reserves a liquid fluid that is used to lubricate and/or cool at least one of the second motor and the power transmission line.