A supporter is provided in which compared to a band-shaped clothing in the related art, the number of members is small and a fitting method is simple and which can give an intraperitoneal pressure rise effect to a supporter wearer, attain retroflexion suppression, and stabilize the sacroiliac joint. A supporter (100) includes a base material (10) which is formed of a knitted fabric by warp knitting and in which a knitting direction of the knitted fabric is set to be a longitudinal direction (L), and stretchability in the longitudinal direction (L) is given, while stretchability in a short direction (S) is suppressed, a back-supporting section (11) that is a central portion of the base material (10), projection sections (12) provided by projecting upward both end portions disposed on both sides of the back-supporting section (11), and curved sections (13) each making the vicinity of the boundary between the back-supporting section (11) and each of the projection sections (12) be curved into a shape of approximate "/ \".
