A reversible mechanism is disposed on a stroller including a stroller frame and a reversible member pivoted to the stroller frame. The reversible mechanism includes anchoring portions disposed on different positions of the stroller frame, a sliding sleeve movably jacketing the reversible member, and a release actuator movably disposed on the reversible member and linked with the sliding sleeve. The sliding sleeve is selectively engaged with any one of the anchoring portions for locking the reversible member. The reversible member includes a joint structure including a cutout portion. The release actuator includes an operating portion protruding from the cutout portion and is slidable along a lengthwise direction of the reversible member through operating the operating portion to switch the sliding sleeve between a locking position and a releasing position.