Baby stroller

The invention discloses a baby stroller, which comprises a stroller frame, front wheel assemblies, back wheel assemblies and a locking device, wherein the stroller frame has a unfolding state and a folding state, the locking device is used for locking the stroller frame in the unfolding state, and particularly, the stroller frame comprises bottom rods, back support rods and push rods; each bottom rod extends in the fore-and-aft direction, the lower part of each back support rod is rotationally connected with the back end part of the corresponding bottom rod, the bottom of each push rod is rotationally connected with the upper end part of the corresponding back support rod, the front wheel assemblies and the back wheel assemblies are respectively and rotationally connected with the front end parts and the back end parts of the bottom rods, the locking device comprises a first locking unit, during unfolding, the back support rods and the back wheel assemblies are in locked connection through the first locking u