To provide an umbrella which can be changed in the planar figure except for circular and main ribs can be easily held together without folding joints of the main ribs when it is closed.

At least one of main ribs is equipped with the first main rib 21 and the second main rib 22, an end of the first main rib 21 is attached to an inside cap 12 so that it can swing, the second main rib 22 is attached to another end of the first main rib 21 so that it can move in/out. Then, a runner 41 for deformation is attached to an inner bar 11 so that it can slide along and the runner 41 for deformation and the posterior part of the second main rib 22 are connected together with wire 42. The second main rib 22 drawn into and out of the first main rib 21 makes a planar shape of the umbrella change when the runner 41 for deformation slides along the inner bar 11.