A drive force control system for a hybrid vehicle, comprising: an engine; a first rotary machine that is configured to translate an output power of the engine partially into an electric power; a transmission mechanism that is configured to distribute an output torque of the engine to the first rotary machine side and an output member side, wherein an operating mode can be selected from a first mode in which the output torque of the engine is delivered to the output member side at a first predetermined ratio, and a second mode in which the output torque of the engine is delivered to the output member side at a second predetermined ratio that is smaller than the first predetermined ratio; a battery; a second rotary machine to which at least one of the electric power translated by the first rotary machine and an electric power accumulated in the battery is supplied to generate a power, wherein the control system is configured to generate a maximum drive force to propel the vehicle by operating the engine to generate an upper limit power, while operating the second rotary machine to generate a power by supplying the electric power translated by the first rotary machine and a maximum output power of the battery to the second rotary machine; and a controller that is configured to control the transmission mechanism, wherein the drive force control system is characterized by the controller being configured to restrict selection of the first mode when an available output power of the battery to be supplied to the second rotary machine is smaller than a predetermined value, wherein the predetermined value is reduced with an increase in the upper limit power of the engine. an engine; a first rotary machine that is configured to translate an output power of the engine partially into an electric power; a transmission mechanism that is configured to distribute an output torque of the engine to the first rotary machine side and an output member side, wherein an operating mode can be selected from a first mode in which the output torque of the engine is delivered to the output member side at a first predetermined ratio, and a second mode in which the output torque of the engine is delivered to the output member side at a second predetermined ratio that is smaller than the first predetermined ratio; a battery; a second rotary machine to which at least one of the electric power translated by the first rotary machine and an electric power accumulated in the battery is supplied to generate a power, wherein the control system is configured to generate a maximum drive force to propel the vehicle by operating the engine to generate an upper limit power, while operating the second rotary machine to generate a power by supplying the electric power translated by the first rotary machine and a maximum output power of the battery to the second rotary machine; and a controller that is configured to control the transmission mechanism, wherein the drive force control system is characterized by the controller being configured to restrict selection of the first mode when an available output power of the battery to be supplied to the second rotary machine is smaller than a predetermined value, wherein the predetermined value is reduced with an increase in the upper limit power of the engine.