A foldable bed includes a plurality of connecting bars, a plurality of support bars, and a plurality of stand units. Each of the stand units includes two pivotally connected support legs each having a first end provided with an upper support portion, a second end provided with a lower support portion, and a middle section provided with a pivot portion. Each of the stand units further includes two clamping brackets each mounted on the respective support leg, and two vibration absorbers each mounted in the respective clamping bracket. Thus, when the two support legs are expanded, each of the vibration absorbers on one of the support legs abuts the pivot portion of the other one of the support legs so that the support legs are combined solidly and stably so as to enhance the structural strength of each of the stand units.