NOVELTY - A cover glass (1) has glass plate (10) having main surface (s1) (11a), main surface (s2) (11b) and end surface (12) interposed between main surface (s1) and main surface (s2). The glass plate has plate thickness of 0.5-1.5 mm, and chemical strengthening process is carried out. The surface pressure shrinkage-stress value of main surface is 400-1000 MPa. The thickness of plate thickness direction of compressive-stress layer in main surface is 15-50 mu m. The glass plate has concentric-circle bending strength of 30 kgf or more.    USE - Cover glass is used for solar cell module for factory roof installation, public transport system station building roof installation and photovoltaic power generation work (all claimed). Uses include but are not limited to factory roof, railway, photovoltaic power plant, stop, airport, harbor shall and household.    ADVANTAGE - The cover glass has excellent strength after long-term use, and wear resistance, and is lightweight.    DETAILED DESCRIPTION - A cover glass has glass plate having main surface (s1), main surface (s2) and end surface interposed between main surface (s1) and main surface (s2). The glass plate has plate thickness of 0.5-1.5 mm, and chemical strengthening process is carried out. The surface pressure shrinkage-stress value of main surface is 400-1000 MPa. The thickness of plate thickness direction of compressive-stress layer in main surface is 15-50 mu m. The glass plate has concentric-circle bending strength of 30 kgf or more. square-shaped glass sample having length of 50 mm and width of 50 mm is acquired from glass plate by planar view. The rubbing line having length of 20 mm is formed in the direction of length at the main surface (s1) along with line displaced in parallel to 3 mm right side from central line of vertical direction, 3 reciprocations of 400 count sandpaper of 10 mm square-shape of 10 mmasterisk10 mm of each upper and lower sides by load of 1.5 kgf from central line of direction beside glass sample. The main surface (s1) of glass sample is connected to support ring, and central point of glass sample and support ring overlaps on support ring having diameter of 30 mm. The glass sample is installed on support ring. A load ring having diameter of 10 mm is mounted such that both central point is overlap. When a load is loaded on glass sample at 1 mm/minute from load ring side, load which destruction produces is carried out to glass sample with concentric-circle bending strength. An INDEPENDENT CLAIM is included for solar cell module.    DESCRIPTION OF DRAWING(S) - The drawing shows perspective view of cover glass. (Drawing includes non-English language text)    Cover glass (1)    Glass plate (10)    Main surfaces (11a,11b)    End surface (12)