A rotary machine system comprising: a rotary electric machine that has a rotary electric rotor and has a rotary electric machine bearing rotatably supporting the rotary electric rotor; a rotary machine that has a rotary machine rotor that is configured to rotate with the rotary electric rotor and has a rotary machine bearing rotatably supporting the rotary machine rotor; a first supply line through which a lubricating oil is supplied to the rotary electric machine bearing; a second supply line through which the lubricating oil is supplied to the rotary machine bearing at a flow rate higher than that in the first supply line; a first discharge line through which the lubricating oil is discharged downward from the rotary electric machine bearing; a second discharge line through which the lubricating oil is discharged downward from the rotary machine bearing at a flow rate higher than that in the first discharge line; a lower discharge line through which the lubricating oil discharged from the first discharge line and the second discharge line flows toward a discharge destination, and a transmission disposed between the rotary electric machine and the rotary machine; a third supply line through which the lubricating oil is supplied to the transmission; a third discharge line through which the lubricating oil is discharged downward from the transmission, wherein the lower discharge line has a first connecting portion connected to a lower end of the first discharge line and a second connecting portion connected to a lower end of the second discharge line, and extends such that the lubricating oil heads for the discharge destination through the first connecting portion from the second connecting portion, and wherein a lower end of the third discharge line is connected to the lower discharge line between the first connecting portion and the second connecting portion. characterized in that a sealing property around the rotary electric machine bearing of the rotary electric machine is lower than a sealing property around the rotary machine bearing of the rotary machine, wherein the lower discharge line is formed so that the lubricating oil, which is discharged from the second discharge line and the third discharge line, flows through a lower layer portion in the lower discharge line and a gas layer is formed in an upper layer portion in the lower discharge line at the first connecting portion, and wherein an amount of the lubricating oil discharged from the second discharge line and the third discharge line is an amount that causes the gas layer (k) to flow toward the discharge destination such that the lubricating oil in the first discharge line is drawn into the lower discharge line. a rotary electric machine that has a rotary electric rotor and has a rotary electric machine bearing rotatably supporting the rotary electric rotor; a rotary machine that has a rotary machine rotor that is configured to rotate with the rotary electric rotor and has a rotary machine bearing rotatably supporting the rotary machine rotor; a first supply line through which a lubricating oil is supplied to the rotary electric machine bearing; a second supply line through which the lubricating oil is supplied to the rotary machine bearing at a flow rate higher than that in the first supply line; a first discharge line through which the lubricating oil is discharged downward from the rotary electric machine bearing; a second discharge line through which the lubricating oil is discharged downward from the rotary machine bearing at a flow rate higher than that in the first discharge line; a lower discharge line through which the lubricating oil discharged from the first discharge line and the second discharge line flows toward a discharge destination, and a transmission disposed between the rotary electric machine and the rotary machine; a third supply line through which the lubricating oil is supplied to the transmission; a third discharge line through which the lubricating oil is discharged downward from the transmission, wherein the lower discharge line has a first connecting portion connected to a lower end of the first discharge line and a second connecting portion connected to a lower end of the second discharge line, and extends such that the lubricating oil heads for the discharge destination through the first connecting portion from the second connecting portion, and wherein a lower end of the third discharge line is connected to the lower discharge line between the first connecting portion and the second connecting portion. characterized in that a sealing property around the rotary electric machine bearing of the rotary electric machine is lower than a sealing property around the rotary machine bearing of the rotary machine, wherein the lower discharge line is formed so that the lubricating oil, which is discharged from the second discharge line and the third discharge line, flows through a lower layer portion in the lower discharge line and a gas layer is formed in an upper layer portion in the lower discharge line at the first connecting portion, and wherein an amount of the lubricating oil discharged from the second discharge line and the third discharge line is an amount that causes the gas layer (k) to flow toward the discharge destination such that the lubricating oil in the first discharge line is drawn into the lower discharge line.