Abstract: An umbrella includes a shaft with a runner movably mounted thereto and a first cap and a second cap are respectively connected to a top end of the shaft. The first cap is located closer than the second cap to the second end of the shaft. A plurality of first ribs pivotably connected to the second end cap and a main panel is mounted to the first ribs. The main panel has a hole with a center at the shaft. Each first rib has a join connected thereto and each joint having a first passage through which the first rib extends and a second passage through which one of second ribs extends. Each second rib has a first end thereof pivotably connected to the first cap and a section of the second end of each of the second ribs is overlapped on the main panel. A sub-panel is attached to the second ribs and covers the hole in the main panel. A plurality of stretchers are pivotably connected between the runner and the joints.