Abstract: A skeleton for umbrellas includes an elongated shank, a runner slidably mounted on the shank, a sleeve slidably fitted on the shank and arranged above the runner, a spring disposed between the runner and the sleeve, and a joint fixedly secured to an upper end of the shank, characterized in that a plurality of primary stretchers are pivotally connected with the sleeve, a plurality of secondary stretchers having an end pivotally connected with an upper end of the runner and having another end pivotally connected with an intermediate portion of a respective one of the primary stretchers, a plurality of reinforcing arms pivotally connected at a first end thereof with another end of a respective one of the primary stretchers, and a plurality of ribs pivotally connected at an end with the joint and pivotally connected with a second end of a respective one of the reinforcing arms.