Abstract: A lumbago correcting belt is disclosed, comprising a belt body adapted to be attached to a lumbar region of a human body to enclose and surround the iliac bones and a pair of tightening members made of a flexible material the tightening members being disposed and spaced from each other on an outer circumferential face of the belt body. Each of the tightening members has two legs branched therefrom which compress the iliac bones by a tightening force selectively given to only one of the two legs. In one embodiment, a first set of engaging means is provided, one member of which is provided at one end portion of the belt body on an outer circumferential face thereof and another member of which is provided at the other end portion of the belt body on an inner circumferential face thereof, and a second set of engaging means is provided on the tightening members at one face of front end portions thereof.