The present invention is to provide a supporting mechanism disposed on a hammock for supporting a mattress, and the supporting mechanism includes a folding component and a plurality of supporting components. The folding component is disposed on a central position of the hammock, and the folding component includes an upper surface, a lower surface and an avoiding section passing through the upper surface and the lower surface. The plurality of supporting components is disposed around the folding component and for supporting the mattress. An end of each of the plurality of supporting components is pivotally connected to the folding component, and the other end of each supporting component is fixed on an edge position of the hammock. The operation of the supporting mechanism is easy so that the hammock and the bedstead can be folded or unfolded together. Accordingly, the present invention is to provide a crib therewith.