PURPOSE: To obtain a water storage device in which a door is conveniently operated at the time of setting a water supply tank for an icemaker in a refrigerator and the setting can be simplified.

CONSTITUTION: A refrigerator comprises a water storage tank 21 having a water supply cock, and a water tray 26 having a protrusion for opening/closing the clock. The cock of the tank 21 is opened by engaging the cock of the tank 21 with the protrusion of the tray 26 to guide the water of the tank 21 to the tray 26, and a predetermined quantity of the water measured by the tray 26 is supplied to an icemaking tray. A tray 24 longitudinally slidably supported to place the tank 21 is provided. The tray 24 has a connector to be connected to the tank 21, and a switching auxiliary unit for opening/closing a door 35 by rotating the door 35 by the longitudinal operation. The tray 26 has a guide for vertically moving the tank 21 by the longitudinal operation of the tray 24 to attach or detach the clock to or from the protrusion.