Provided is a method of manufacturing a tempered glass, including an etching step of etching a plate-shaped or sheet-shaped chemically tempered glass having a compressive stress layer in a surface thereof. The method further includes a step of preparing, as the chemically tempered glass before the etching, a chemically tempered glass, which has in at least part thereof a bendable thin portion having a thickness t1a, in which the thickness t1a is 150 m or less, in which a maximum compressive stress CSa in the compressive stress layer before the etching is 1,100 MPa or less, and in which a depth DOLa of the compressive stress layer before the etching is less than 15 m. The etching step includes etching the chemically tempered glass so that an etching amount t on one surface of the chemically tempered glass is 0.25 m or more and 3 m or less.