SOLAR CELL

PROBLEM TO BE SOLVED: To prevent a substrate from warping due to thermal stress when a thin film is formed even if a low melting material such as SLG containing much Na is used in order to improve the crystal growth in a thin light-absorbing layer by evaporation caused by diffusion of Na. SOLUTION: A solar cell wherein a CIS (a compound of element selected from among Cu, In and Se) or CIGS-based (a compound of element selected from among Cu, In, Ca and Se) thin film is formed as a light-absorbing layer 3 on a substrate 1 via a metal electrode layer 2. The substrate 1 is a coupled body of a first substrate 11 containing Na and a second substrate 12 made of a high melting material. The thin light absorbing layer 3 is formed on the first substrate 11 via the electrode layer 2 by evaporation.