To provide an umbrella cover which is attached to an umbrella having an end part of an optional thickness.

A plurality of cylindrical cover members 3nA having different cross-sectional diameters are provided, and the cylindrical cover members are telescopically connected in order of the largeness of the cross-sectional diameters. An attachment and detachment part 32A is provided at the end of the cover member 3nA. When an adjusting member 62 is inserted in the axial direction relative to a flexible part 612 disposed in the inner circumferential direction in the attachment and detachment part 32A, a guide part 622 narrows an interval between the flexible parts 612, and retaining force is generated in accordance with the thickness of the end part 101.