A closable centrifuge cup, comprising a cup and a lid which can be placed on the cup edge, closes the cup opening and can be fastened under tension by means of at least one clamping element with its lid edge to the cup edge, characterized by at least one of the following properties: the cup edge or a gasket arranged in the region of the cup edge protrudes further in the direction towards the lid edge in a region remote from the at least one clamping element in the circumferential direction of the cup edge than in a region situated closer to the at least one clamping element; the lid edge or a gasket arranged in the region of the lid edge protrudes further in the direction towards the cup edge in a region remote from the at least one clamping element in the circumferential direction of the lid edge than in a region situated closer to the at least one clamping element.