Syringe piston for fat transfer is built, so that free oil is easy to that back side discharge is separated and traveled naturally through from suction of fat with the syringe piston with a filter. For fat transfer, the syringe piston being arranged in a syringe-shaped cylindrical vessel includes that a piston body does not have axis without an axis, what is sealed between piston body and syringe-shaped cylindrical vessel is coupled in the packaging of an outer surface of piston body, the front and back of one free oil discharging hole and piston body, one open and close device communicates, it is arranged in free oil therethrough and is discharged into filter fat and transmits in a channel of free oil for opening and closing free oil discharging hole and a filter device.
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