Abstract: A brush correcting device for toothbrush, comprising a toothbrush support body (2) having a support part (2a) for supporting at least the tip side lower surface of a toothbrush (T) and one of two guide groove parts or guide elongated holes (2e, 2f) formed on the tip upper side of the toothbrush (T) supported by the support part (2a), and a band-shaped convergent body inserted into one or two guide groove parts or guide elongated holes (2e, 2f) and bent in U-shape, V-shape, or channel-shape at the center thereof, whereby the brush correcting device for toothbrush allowing a variety of toothbrushes to be corrected according to the shape of the brush part can be provided at a low production cost.