Abstract: A foldable stroller includes a seat frame, a pair of wheel frame units disposed on two sides of the seat frame, a backrest frame mounted pivotally to the seat frame, a pair of connecting frames disposed on the two sides of the seat frame, a handle unit and a catch mechanism for retaining releasably the foldable stroller in an unfolded position. Each of the wheel frame units includes a front support member, a rear support member connected pivotally to the seat frame, and a connector for interconnecting pivotally the front and rear support members.