Abstract: An apparatus for producing annular fiber aggregate includes: a container including an inner cylinder and an outer cylinder disposed concentrically, whereby forming an upright cylindrical space between the inner cylinder and the outer cylinder; at least a pair of positive electrode and negative electrode disposed by turns and buried in the wall of the outer cylinder, parallely with respect to the axis of the upright cylindrical space; a filter member disposed at the lower portion of the upright cylindrical space; and a voltage applicator connected to the positive electrodes and the negative electrodes. Since the apparatus has the positive and negative electrodes buried in the wall of the outer cylinder, the fibers are hardly disturbed and lifted by the positive and negative electrodes even when the positive and negative electrodes are rotated relatively around the axis of the upright cylindrical space.