A solar cell module comprising: a front substrate; a rear substrate facing the front substrate; a plurality of solar cells disposed between the front substrate and the rear substrate; a first sealing agent disposed between the plurality of solar cells and the front substrate; and a second sealing agent disposed between the plurality of solar cells and the rear substrate, wherein the rear substrate includes a base film including polyethylene terephthalate, PET, having a thickness of 250 to 500 μm, a first coating layer formed on an upper side of the base film, and a second coating layer formed on a lower side of the base film, wherein the first coating layer is in contact with the second sealing agent, and the first coating layer has a thickness thicker than that of the second coating layer, the thickness of the first coating layer being 20 μm to 50 μm, and the thickness of the second coating layer being at least 5 μm, and wherein the first coating layer includes polyvinylidene difluoride, PVDF, and a white pigment being 40 to 80 percent by weight of the first coating layer, and the second coating layer includes PVDF and one of the following is fulfilled for the second coating layer: the second coating layer includes a pigment having a type different from that of the white pigment of the first coating layer, the second coating layer includes a white pigment, and a content of the white pigment of the first coating layer is greater than a content of the white pigment of the second coating layer, and the second coating layer does not include a pigment. a front substrate; a rear substrate facing the front substrate; a plurality of solar cells disposed between the front substrate and the rear substrate; a first sealing agent disposed between the plurality of solar cells and the front substrate; and a second sealing agent disposed between the plurality of solar cells and the rear substrate, wherein the rear substrate includes a base film including polyethylene terephthalate, PET, having a thickness of 250 to 500 μm, a first coating layer formed on an upper side of the base film, and a second coating layer formed on a lower side of the base film, wherein the first coating layer is in contact with the second sealing agent, and the first coating layer has a thickness thicker than that of the second coating layer, the thickness of the first coating layer being 20 μm to 50 μm, and the thickness of the second coating layer being at least 5 μm, and wherein the first coating layer includes polyvinylidene difluoride, PVDF, and a white pigment being 40 to 80 percent by weight of the first coating layer, and the second coating layer includes PVDF and one of the following is fulfilled for the second coating layer: the second coating layer includes a pigment having a type different from that of the white pigment of the first coating layer, the second coating layer includes a white pigment, and a content of the white pigment of the first coating layer is greater than a content of the white pigment of the second coating layer, and the second coating layer does not include a pigment. the second coating layer includes a pigment having a type different from that of the white pigment of the first coating layer, the second coating layer includes a white pigment, and a content of the white pigment of the first coating layer is greater than a content of the white pigment of the second coating layer, and the second coating layer does not include a pigment.