A water dispenser which is connected to a pure water source and used for dispensing pure water includes: an arm mounting unit; a water dispensing gun including a nozzle for discharging pure water; a holding unit for holding the water dispensing gun; and at least two arms connecting the holding unit to the arm mounting unit. The at least two arms constitute a parallel link mechanism in which a trajectory of each arm when the at least two arms move is within the same vertical plane.