an electric vacuum cleaner includes a first dust separation device configured to separate sucked dust , a first dust collection section for collecting the separated dust , a second dust separation device configured to separate the dust , a dust removing device configured to remove the dust adhering to the second dust separation device , a second dust collection section for accumulating the removed dust , a partition wall for zoning the first dust collection section and the second dust collection section and an introduction opening for introducing the removed dust into the second dust collection section ; the partition wall includes a communication opening for communicating the first dust collection section to the second dust collection section and an opening and closing member for closing either of the introduction opening or the communication opening and switching the closing to the other by rotating , and the opening and closing member closes the introduction opening with a negative pressure by an electric fan and closes the communication opening by its own weight when the electric fan is not driven .