To provide a fixed volume water supply device having a simple and compact structure, easy in setting operation of an integrated flow rate of supply water, and grasping a supply water residual quantity from a start of water supply at a glance.

This fixed volume water supply device 10 stops water supply when the integrated flow rate of the supply water reaches a preset flow rate, and comprises a generator 24 for generating electric power by a water flow of a waterway 20, and detecting the integral flow rate of water flowing in the waterway 20, a solenoid valve 22 for opening and closing the waterway 20, a controller 48 for closing the solenoid valve 22 when the integral flow rate reaches the preset flow rate, a setting operation part 50 for performing setting operation on the integral flow rate up to stopping from a start of the water supply, and a display part 100 for displaying the preset flow rate, and every second changing a display of a present supply water residual quantity.