Abstract: A collapsible structure for baby strollers includes a main frame including two first support rods on two sides thereof and each first support rod has an engaging member which includes a protrusion. Each first support rod has a connection part which includes a first hook. Two handles are pivotally connected to the two engaging members respectively, and the two handles are provided with two locking units. Each locking unit has a first connection member extending through a pull member and a second connection member extending through a restriction member. The restriction member includes a recess with which the protrusion is engaged. The locking units each further have a space in which a resilient member is located. A third connection member extends through a positioning hole of each locking unit and the resilient member contacts the third connection member. A second hook is provided on the restriction member to securely engage with the first hook.

Abstract: A retractable frame structure of a baby stroller includes a frame, a pair of scissors-type linking sets, a push rod and a linking rod. Each scissors-type linking set is connected with the push rod and the link rod, respectively. When pushing the pushing rod, the scissors-type linking set will be collapsed and the linking rod will urge front wheels to move backward towards rear wheels, thus the collapsed stroller has a compact size which is convenient to carry and to store.