Cover glass for display device, and manufacturing method for same

A cover glass for display devices, comprising:

• a chemically strengthened glass manufactured by ion exchange of a surface layer of a glass plate to replace Na ions with K ions,
• the cover glass having a main surface part in which a compressive stress layer is formed and a side surface part that has a region where the compressive stress layer is formed and a region where no compressive stress layer is formed,
• the compressive stress layer having a depth of 6 to 15 μm,
• wherein a shape parameter determined in accordance with MS R 1625 (1996) based on analysis of a facture stress of the cover glass measured by a coaxial double ring test is not less than 7, and strength of the cover glass when a cumulative fracture probability is 1% is not less than 450 MPa;
• and
• the glass plate before the ion exchange is made of soda-lime glass substantially composed of SiO2:
• 65 to 75%, Na2O+K2O:
• 5 to 20%, CaO:
• 2 to 15%, MgO:
• 0 to 10%, and Al2O3:
• 0 to 5% on a mass basis.