A hinge for a foldable boat ladder which permits the ladder to be stowed in its folded position without the need for additional fastening means. The hinge comprises a pair of sockets each having a plurality of leaves, the leaves interfitting. The leaves for the upper portion of the ladder have aligned holes carrying a stationary hinge pin. The leaves on the lower socket have inclined slots engaging this pin. In the lower hinge position the sockets are aligned. When the lower socket is swung upwardly 180 DEG , its leaf slots slide downwardly and inwardly. The lower ends of these leaves engage the lower portion of the upper socket, and a bridge extending between the leaves above the pin engages a leaf on the upper socket. This prevents rattling and permits the sockets to be held firmly together, but still far enough apart so that steps on the upper and lower ladder portions may be aligned without touching.
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