A safety umbrella includes: a central shaft; a rib assembly having a plurality of top ribs pivotally secured to an upper notch on the shaft each top rib pulled by a pulling rope to be tensioned towards an upper portion on the shaft, and a plurality of stretcher ribs each pivotally connected between each top rib and a runner slidably held on the shaft, with each stretcher rib forming an acute angle between the stretcher rib and the shaft; whereby upon opening of the umbrella, the tension force as effected by the pulling rope and acting upon each top rib will be transferred to each stretcher rib to form an upwardly orienting fraction force to lift the stretcher rib along the shaft to stably hold the rib assembly at an opening state; and a ball resiliently held in a lower portion of the shaft, whereby upon closing of the umbrella, the runner will be engaged with the ball for stably retracting the rib assembly at a folded condition, thereby eliminating the acute spring catches as found in a conventional umbrella and preventing from injury to the umbrella user.
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