A drive system (10) is configured to split driving force produced by an engine (11) to a first motor (12) side and an output gear (16) side, and add driving force produced by a second motor (13) that is driven with electric power generated by the first motor (12), to the driving force delivered from the output gear (16). A first planetary gear mechanism (14) performs differential operation, using a first input element (22) that receives the driving force produced by the engine (11), a first reaction-force element (23) coupled to the first motor (12), and a first output element (24). A second planetary gear mechanism (15) performs differential operation, using a second input element (26) coupled to the first output element (24), a second output element (27) coupled to the output gear (16), and a second reaction-force element (28). A first clutch mechanism (17) selectively couples the first input element (22) with the second reaction-force element (28). A first brake mechanism (18) selectively inhibits rotation of the second reaction-force element (28).