To provide a safety device for a stroller for always securing safety by preventing a going-out-of-control of the stroller separated from a user even if the user separates hands from a handle.

A reel device formed by winding a certain length of a cable 3 such as a chain and a wire around a reel 4 and energizing the reel in the cable winding direction with a coil spring 5 is fixed to a part of the stroller 11. A mooring tool 7 is provided at a tip of the cable to moor the stroller to a belt or the like of the user running the stroller.