The present invention relates to a centrifugal separator (5) including a rotor (51) which pivotally supports a container (9) including an upper opening (90B) and which is to be rotated to apply a centrifugal force to the container (9). The rotor (51) includes an evaporation preventer (55A) for preventing separation target liquid contained in the container (9) from evaporating when the rotor (51) is rotated. The evaporation preventer (55A) includes a standing wall (55Ab) which is positioned in front of the upper opening (90B) when the container (9) is pivoted by rotating the rotor (51).