Solar cell back surface protective sheet, a solar cell module and the gas barrier film

The present invention provides a back protective sheet for excellent solar cell in gas barrier properties such as oxygen and water vapor. The back protective sheet for a solar cell of the present invention, 23 ° C. in conformity with JIS K7126, a thickness measured at a relative humidity of 90% is water vapor transmission rate when the 100μm or less 10g / m