Abstract: A mooring device for boats comprising an elongate arm having first and second ends. The arm has a transverse slot therein adjacent the first end, and dimensioned to received a cleat. The slot is in effect a fixed hook which opens to the side of the arm. A rotatable is mounted to the second end of the arm for rotation about an axis parallel to the longitudinal axis of the arm. The hook is rotatable between a closed position in which its free leg opposes the second end of the arm and an open position in which its free leg is spaced from the second end. In the closed position, the hook lies in a plane perpendicular to the plane of the slot. The hook is dimensioned to engage a cleat. A locking mechanism such as a sliding bolt is provided for locking a cleat in the slot. The arm can be telescopic, or provided with hinges which are pivotable in opposite directions, so that it can be adjusted for boarding and deboarding.