Wafer including a reinforcing flange formed upright at a periphery and method for manufacturing the same

A wafer with an orientation notch being cut in a portion of its circumference, the wafer includes: a reinforcing flange formed upright at periphery; and a thin section surrounded by the reinforcing flange and having a smaller thickness than the reinforcing flange. The reinforcing flange includes a circumferential portion formed upright along the circumference and a notch portion formed upright near the orientation notch, and a width of the circumferential portion as viewed parallel to a major surface of the wafer is smaller than a depth of the orientation notch as viewed parallel to the major surface.