An adjustable bed includes: a head frame and a foot frame; a head lifting assembly including a head lifting bracket pivotally connected to the head frame, and a head lifting actuator pivotally connected between the head lifting bracket and the head frame for operably driving the head lifting bracket to pivotally move in an upward rotating direction or a downward rotating direction; a foot lifting assembly including a foot lifting bracket pivotally connected to the foot frame, and a foot lifting actuator pivotally connected between the foot lifting bracket and the foot frame for operably driving the foot lifting bracket to pivotally move in an upward rotating direction or a downward rotating direction; and a folding mechanism connecting the head frame and the foot frame such that the head frame and the foot frame are pivotably foldable to one another at the folding mechanism.