Water supply system for fuel cell

A water supply system for a fuel cell, which includes: a water storage tank; a pump which is located above a water level in the tank and supplies water to the fuel cell; a first passage from the pump to the fuel cell, which has a first portion placed in a position below a discharge port of the pump; an air compressor which supplies air to the tank and the first passage;a second passage which is connected to the first portion of the first passage and opened to the atmosphere; a valve provided on the second passage, which discharges water remaining in either the pump or the first passage through the second passage; and a controller for controlling the valve, which opens the valve as the water supply to the fuel cell is stopped.