Centrifugal field-flow fractionation device having a restricting member to prevent deformation of an intermediate layer

A centrifugal field-flow fractionation device comprising:

• an annular rotor that rotates about a rotational axis;
• an arc-shaped channel member that is provided along an inner peripheral surface of the rotor, has therein a channel for a liquid sample by laminating a plurality of layers, and has an inlet for the liquid sample to the channel and an outlet for the liquid sample from the channel;
• a rotation drive unit that, by rotating the rotor, classifies particles in the liquid sample in the channel by centrifugal force;
• and
• a restriction unit that restricts the channel from being compressed to a height equal to or less than a certain height when the channel member is compressed and deformed in a laminating direction,
• wherein the plurality of layers include an outer surface layer provided on a rotor side, an inner surface layer provided on a rotational axis side, and an intermediate layer provided between the outer surface layer and the inner surface layer and forming a surface defining the channel between the outer surface layer and the inner surface layer,
• wherein the restriction unit is provided apart from the outer surface layer, the inner surface layer and the intermediate layer, and the intermediate layer is formed of a material having a lower compressive elasticity modulus than that of the restriction unit.