Abstract: A stroller includes a frame, a seat, two retaining mechanisms, and two retaining seats. The frame has a pair of first side portions. The seat has a bottom plate portion, a pair of second side portions, and a backrest portion. The retaining mechanisms are disposed respectively on one pair of the pair of the first side portions and the pair of the second side portions. Each of the retaining mechanisms includes a resilient pressing portion and a retaining hook. The retaining seats are disposed respectively on the other pair of the pair of the first side portions and the pair of the second side portions. Each of the retaining seats has a retaining groove engaging the corresponding retaining hook. The resilient pressing portions can be pressed to remove the retaining hooks from the retaining grooves.