Cooling water pump device for outboard motor

A cooling water pump device of an outboard motor, for pumping cooling water toward an engine of an outboard motor that includes a hollow driveshaft housing under an engine and a driving shaft vertically mounted in the driveshaft housing for transmitting the drive force of the crankshaft of the engine to a screw, comprising:

• a pump case made of resin disposed at a position partway, with respect to the axial direction of the driveshaft, inside the driveshaft housing;
• a sleeve made of metal fitted in the pump case;
• an impeller made of elastic material mounted eccentrically in the pump case with the metal sleeve interposed therebetween, the impeller being rotated by rotational drive of the driveshaft to draw cooling water from the bottom of the pump case and pump the cooling water toward the engine located above;
• and
• a plurality of annular seal elements for keeping the interface between the inner peripheral surface of the resin pump case and the metal sleeve watertight, arranged between the inner peripheral surface of the resin pump case and the metal sleeve, surrounding the driveshaft, and disposed at plural positions vertically apart with respect to the axial direction of the driveshaft.