A lower back supporter including a pair of flat anchor parts that come into contact with the lower back of a wearer with a specified space in between, a pair of anchor belts that wrap around the abdomen with the end portions connected to each other, a first and second support belt that cross over each other on the back, and a connecting belt that connects the anchor parts. The inner side surface of the anchor part comprising a non-slip material that closely contacts the skin of the wearer, and the outer side surface comprising a material that fastens to surface fasteners. After the anchor belts are put on, operation belts connected to the first and second support belts are pulled, the surface fasteners are fastened to the outer side surfaces of the anchor parts, applying tensile force between the anchor parts in closely contact to the lower back.