Field flow fractionation device including mass balancer portion

A field flow fractionation device, comprising:

• a rotor having:
• a rotor base that is supported by a rotational axis, that spreads in the direction of the diameter from said rotational axis, and has a circular outer periphery;
• and a peripheral portion that is provided along the outer periphery of said rotor base and where an inner circumferential surface that is parallel to the direction of the axis line of said rotational axis is formed;
• a channel that is attached to the inner circumferential surface of said peripheral portion and where a classification flow path for causing field flow fractionation by means of a centrifugal force is created;
• a flow path for feeding a sample liquid into said classification flow path;
• a flow path for feeding a sample liquid out from said classification flow path;
• and
• a rotational drive mechanism for rotating said rotational axis, wherein
• a channel installation portion having said inner circumferential surface formed is formed on one side of the peripheral portion of said rotor, and a mass balancer portion for adjusting the mass distribution of said rotor is formed on the other side with said rotor base in between,
• the mass of said mass balancer portion is adjusted in such a manner that the mass distribution of the rotor is equal between the left and the right with said rotor base in between in the state where said channel is attached to said channel installation portion;
• wherein said channel installation portion and said mass balancer portion are formed so as to be symmetric with the rotor base in between, and a balancer member of which the mass distribution is equal to that of said channel is installed in said mass balancer portion;
• and
• the balancer member is a dummy ring.