A cover member configured to be removable from a liquid container. The cover member includes a resin having a haze value of 14% or more and 96% or less. A thickness of a top surface of the cover member is 3.0 mm or less. A maximum height roughness Rz of the top surface of the cover member is 50 m or less. When a back surface of the top surface of the cover member is defined as a first surface and a surface of the protection portion facing the first surface is defined as a second surface, an L value of the second surface in Commission Internationale de l'Eclairage (CIE) La*b*color space is 5 or more and 35 or less. A shortest distance between the first surface and the second surface is 0.4 mm or more and 2.0 mm or less.