A foldable stroller includes a frame and a locking component. The frame includes a handle, a front foot, a rear foot, and a carrier support. An upper end of the front foot is pivoted to the handle. An upper end of the rear foot is pivoted to the handle. The carrier support includes at least one connecting rod. An end of the at least one connecting rod is pivoted to the front foot, and the other end of the at least one connecting rod is pivoted to the rear foot. The locking component is installed between the rear foot and the handle. The locking component locks rotation of the rear foot relative to the handle when the foldable stroller is unfolded. Due to aforementioned structure, the foldable stroller is not only reliable in operation but also has a smaller occupied space after being folded.