Abstract: A cyclone separator includes a centrifugal separator which separates solid matters from a fluid mixture containing fluid and solid matters. The centrifugal separator includes a fluid introducing unit which introduces the fluid subjected to the separation of the solid matters. An electric dust collector of the cyclone separator includes a main unit and a container. The container is provided in the fluid introducing unit and houses the main unit. The main unit includes an electrostatic member, an introducing member, a voltage applying unit and a controller. The introducing member is slidable along a longitudinal direction of the electrostatic member. The electrostatic member is switched to an electrically-charged state or a non-electrically-charged state by on and off control of the voltage applying unit using the controller. Minute particles of the solid matters are adhered to the electrostatic member by an electrostatic force generated by electrical charging of the electrostatic member.