A transducer comprising: a substrate having a hole ; a backplate facing an opening of the hole in the substrate ; and a diaphragm facing the backplate with an air gap therebetween, wherein the backplate includes a backplate body , a backplate support secured to the substrate and supporting the backplate body , and a plurality of through-holes perforating the backplate body ; the backplate body includes a center region having a portion of the plurality of through-holes , and three or more peripheral regions partially or completely surrounding the center region and each having another portion of the plurality of through-holes ; each of the three or more peripheral regions partially or completely surrounds the center region ; the plurality of through-holes defines a percentage open area in each of the center region and the three or more peripheral regions , and the percentage open areas are mutually different; the percentage open areas in the center region and in the three or more peripheral regions are constant throughout each region; the percentage open area in the center region is larger than the percentage open area in each of the three or more peripheral regions ; the percentage open area in the outermost peripheral region of the backplate body is smaller than the percentage open area in the peripheral region near the center region ; the percentage open areas in the center region and in the three or more peripheral regions gradually decrease from the center region toward an outermost peripheral region of the backplate body ; and inner surfaces of the through-holes taper with a diameter of the through-hole widening from a surface of the backplate facing the diaphragm toward a surface opposite thereto. a substrate having a hole ; a backplate facing an opening of the hole in the substrate ; and a diaphragm facing the backplate with an air gap therebetween, wherein the backplate includes a backplate body , a backplate support secured to the substrate and supporting the backplate body , and a plurality of through-holes perforating the backplate body ; the backplate body includes a center region having a portion of the plurality of through-holes , and three or more peripheral regions partially or completely surrounding the center region and each having another portion of the plurality of through-holes ; each of the three or more peripheral regions partially or completely surrounds the center region ; the plurality of through-holes defines a percentage open area in each of the center region and the three or more peripheral regions , and the percentage open areas are mutually different; the percentage open areas in the center region and in the three or more peripheral regions are constant throughout each region; the percentage open area in the center region is larger than the percentage open area in each of the three or more peripheral regions ; the percentage open area in the outermost peripheral region of the backplate body is smaller than the percentage open area in the peripheral region near the center region ; the percentage open areas in the center region and in the three or more peripheral regions gradually decrease from the center region toward an outermost peripheral region of the backplate body ; and inner surfaces of the through-holes taper with a diameter of the through-hole widening from a surface of the backplate facing the diaphragm toward a surface opposite thereto. <EOS>