Disclosed is a battery can for a storage battery, provided with a safety valve having a first and a second score groove portion is provided to inner and outer surface of can bottom, can body, or can lid. The first and the second score groove portion face each other, and have a first and a second score groove bottom portion, which have a radius of curvature R, respectively. The R is more than 0.20 mm and less than 1.20 mm, and a distance between the bottom portions is 0.045 to 0.150 mm. The portion, which has the safety valve, is constituted by a plated steel sheet having a steel sheet portion of C content is less than 0.040 mass %, S content is less than 0.020 mass %, and tensile strength TS is less than 400 MPa, and a plate layer formed on a surface of the steel sheet portion.