A centrifugal separation container which is revolved around a rotation axis, the centrifugal separation container comprising: a separation part which comprises a distal region which is disposed on a more distal side than a liquid-to-be-treated supply port and a proximal region which is disposed on a more proximal side than the liquid-to-be-treated supply port, with respect to the rotation axis, and in which a liquid-to-be-treated discharge port is provided in the proximal region; and a recovery part which is disposed on a more distal side than the distal region, communicates with a distal end portion of the distal region through a communication path, and is filled with a recovery liquid for dispersing dispersoids that are to be centrifuged in a liquid to be treated, the separation part is formed in a tubular shape, the liquid-to-be-treated supply port is formed in a peripheral wall of the separation part, and the distal region and the proximal region are provided adjacent to each other in an axial direction of the separation part, wherein the liquid-to-be-treated supply port is inclined in a circumferential direction of the separation part with respect to a radiation direction which extends to pass through a center of the liquid-to-be-treated supply port from a central axis of the separation part, and the liquid-to-be-treated supply port extends, in a case where one end which is located on a side opposite to a central axis side of the separation part across the central axis of the liquid-to-be-treated supply port, out of both ends of the liquid-to-be-treated supply port appearing in a cross section perpendicular to the central axis of the separation part, is defined as an outer end, along a tangent line at the outer end of a circle centered on the central axis of the separation part and passing through the outer end, characterized in that the centrifugal separation container further comprises a rectifying body which is accommodated across the distal region and the proximal region of the separation part and provided along an inner peripheral surface of the separation part with a gap between the rectifying body and the inner peripheral surface of the separation part. a separation part which comprises a distal region which is disposed on a more distal side than a liquid-to-be-treated supply port and a proximal region which is disposed on a more proximal side than the liquid-to-be-treated supply port, with respect to the rotation axis, and in which a liquid-to-be-treated discharge port is provided in the proximal region; and a recovery part which is disposed on a more distal side than the distal region, communicates with a distal end portion of the distal region through a communication path, and is filled with a recovery liquid for dispersing dispersoids that are to be centrifuged in a liquid to be treated, the separation part is formed in a tubular shape, the liquid-to-be-treated supply port is formed in a peripheral wall of the separation part, and the distal region and the proximal region are provided adjacent to each other in an axial direction of the separation part, wherein the liquid-to-be-treated supply port is inclined in a circumferential direction of the separation part with respect to a radiation direction which extends to pass through a center of the liquid-to-be-treated supply port from a central axis of the separation part, and the liquid-to-be-treated supply port extends, in a case where one end which is located on a side opposite to a central axis side of the separation part across the central axis of the liquid-to-be-treated supply port, out of both ends of the liquid-to-be-treated supply port appearing in a cross section perpendicular to the central axis of the separation part, is defined as an outer end, along a tangent line at the outer end of a circle centered on the central axis of the separation part and passing through the outer end, characterized in that the centrifugal separation container further comprises a rectifying body which is accommodated across the distal region and the proximal region of the separation part and provided along an inner peripheral surface of the separation part with a gap between the rectifying body and the inner peripheral surface of the separation part.