Abstract: A rotor includes a plurality of holding cavities for holding specimen containers, respectively. A transverse cross sectional shape of the holding cavity is a substantially triangular shape having one vertex on an inner circumference side of the rotor. Two vertices of the substantially triangular shape are arranged on an outer circumference side of the rotor so as to have equidistance from a rotary shaft of the rotor. Spacing between sides of the substantially triangular shape in a circumferential direction of the rotor gradually increase over 60% or more a radial length of the holding cavity from an innermost circumferential position to the outer circumference side of the rotor when viewed in its transverse plane.

Abstract: A sample container includes a body part which can accommodate a sample and a cap part that can be mounted on the non-circular body part. On the cap part, a neck support member is set for filling a space between an outer lid and a holding hole of a rotor body. The neck support member is configured to be able to be attached to and removed from the outer lid and to be able to relatively rotate with respect to the outer lid. By mounting the outer lid on the body part, the neck support member can also be mounted at the same time. The neck support member is arranged so as to be interposed between the outer lid and shoulder parts of the body part in an axial direction. The neck support member has a lower surface formed so as to correspond to the shape of the shoulder parts.

Abstract: A centrifuge sample container includes: a body portion configured to contain a sample; and a cap portion configured to be engaged with and attached on the body portion. The body portion has a substantially triangular external shape defining three apex portions and three side portions between two of the apex portions when viewed from above and has a circular opening portion in an upper portion of the body portion. Distances between centers of the apex portions are equal to one another. Each of the apex portions is formed with a first radius of curvature when viewed from above. Each of the side portions is formed into a outwardly curved arc-like shape with a second radius of curvature when viewed from above.

Abstract: A rotor includes a plurality of holding cavities for holding specimen containers, respectively. A transverse cross sectional shape of the holding cavity is a substantially triangular shape having one vertex on an inner circumference side of the rotor. Two vertices of the substantially triangular shape are arranged on an outer circumference side of the rotor so as to have equidistance from a rotary shaft of the rotor. Spacing between sides of the substantially triangular shape in a circumferential direction of the rotor gradually increase over 60% or more a radial length of the holding cavity from an innermost circumferential position to the outer circumference side of the rotor when viewed in its transverse plane.