To selectively supply washer fluid to at least three or more fluid supply passages with a simple constitution by using a pump device.

This washer pump system 1 includes the pump device 5 having each of two discharge ports 3 and 4 for discharging the washer fluid with discharge pressure inverted in a size relation according to rotating direction of an impeller 2, a valve mechanism 8 including first and second lead-out flow passages 6 and 7 communicated with each of the discharge ports 3 and 4 and closing the one of the two lead-out flow passages 3 and 4 and opening the other according to a pressure difference of the washer fluid, and a pump control device 11. A sub valve mechanism 10 connected to the valve mechanism 8 includes first and second distribution flow passages 112 and 114 communicated with the first lead-out flow passage 6, and selectively closes either one of the two distribution flow passages 112 and 114 and opens the other according to the size of pressure of the washer fluid discharged from the first lead-out flow passage 6.

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