NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD OF MANUFACTURING THE SAME

Provided is a nonaqueous electrolyte secondary battery in which a flat wound electrode body (80), a nonaqueous electrolytic solution, and an insulating film (10) are accommodated in a quadrilateral battery case (30). The insulating film (10) is formed into a bag shape corresponding to a shape of the electrode body (80) and is arranged between an inner wall of the battery case (30) and the electrode body (80). An entire surface of bottom-side rounded portion of two rounded portions of the electrode body (80), which faces a bottom surface of the battery case, and an inside of the bag-shaped insulating film (10), which faces the bottom-side rounded portion of the electrode body (80), are joined to each other.