A base plate of an ostomy appliance includes a film, an adhesive disposed on a proximal surface of the film, an annular ring connected to the distal surface of the film, and a release liner removably attached to the adhesive. A stoma-receiving through-going hole is formed through the film and the adhesive and the release liner. A first section of the base plate extends radially from the stoma-receiving through-going hole to a second section of the base plate, and the second section extends radially from the first section to an outermost perimeter edge of the base plate. The base plate is formed to have a heat-set curvature such that a proximal side of the second section is convex and a distal side of the second section is concave relative to the annular ring.
