Disclosed is a handle assembly of a vacuum cleaner, comprising a handle pipe having an inlet and an outlet fluidly connected to a suction port assembly and a cleaner body, respectively, a handle formed on the handle pipe to grip for a cleaning work, and a cyclone dust collector protruded at one side of the handle pipe to centrifugally separate dust from an external air flowed in through the inlet of the handle pipe, and discharge a clean air to the outlet of the handle pipe. Accordingly, the cyclone dust collector can be used even in a state that an auxiliary suction tool is connected to the handle assembly.