Abstract: A revolving speed increasing apparatus in which the repulsion of the magnets acts effectively only in the rotational direction to increase the revolving speed by the magnets. A rotary plate, fixed to a rotary shaft so as to integrally rotate, and a fixed plate, fixed to a stationary portion, are opposed to each other. A plurality of radially arranged elongated magnets provided at equal intervals, magnets for demagnetization fixed to the elongated magnets on one side thereof so as to protrude from the tips of the elongated magnets, and plate magnets arranged between the adjacent elongated magnets are provided on the opposed surfaces of the rotary plate and fixed plate. The rotary plate and the fixed plate are arranged with a rotational gap between the tip surfaces of the magnets for demagnetization. The poles at the opposed tips of the elongated magnets on the rotary plate and those on the fixed plate are of the same polarity.