A solar cell module , comprising: a first solar cell ; a second solar cell adjacent to the first solar cell in a first direction, with a space therebetween; a third solar cell adjacent to the first solar cell in a second direction orthogonal to the first direction, with a space therebetween; a line member which electrically connects the first solar cell and the third solar cell in series to form a string; a conductive light-reflective film disposed on a back surface side of the first solar cell and the second solar cell , the conductive light-reflective film extending across the space between the first solar cell and the second solar cell ; an insulating member (32, 32A-32D) disposed between the back surface of the first solar cell and the conductive light-reflective film and between the back surface of the second solar cell and the conductive light-reflective film , the insulating member (32, 32A-32D) extending across the space between the first solar cell an the second solar cell ; and a back-surface side encapsulant covering the first solar cell and the second solar cell from their back surface side, and the conductive light-reflective film , wherein the insulating member (32, 32A-32D) is made of a material harder than a material of the back-surface side encapsulant , the insulating member (32, 32A-32D) includes a first surface on a side opposite the first solar cell , and a second surface on a side opposite the first surface, recesses and protrusions are formed in the first surface, recesses and protrusions are not formed in the second surface, the conductive light-reflective film is made of metal and is formed on the first surface of the insulating member (32, 32A-32D), the insulating member (32, 32A-32D) serving as a base material for the conductive light-reflective film , and the shape of the conductive light-reflective film conforming to the irregularities of the insulating member (32, 32A-32D). a first solar cell ; a second solar cell adjacent to the first solar cell in a first direction, with a space therebetween; a third solar cell adjacent to the first solar cell in a second direction orthogonal to the first direction, with a space therebetween; a line member which electrically connects the first solar cell and the third solar cell in series to form a string; a conductive light-reflective film disposed on a back surface side of the first solar cell and the second solar cell , the conductive light-reflective film extending across the space between the first solar cell and the second solar cell ; an insulating member (32, 32A-32D) disposed between the back surface of the first solar cell and the conductive light-reflective film and between the back surface of the second solar cell and the conductive light-reflective film , the insulating member (32, 32A-32D) extending across the space between the first solar cell an the second solar cell ; and a back-surface side encapsulant covering the first solar cell and the second solar cell from their back surface side, and the conductive light-reflective film , wherein the insulating member (32, 32A-32D) is made of a material harder than a material of the back-surface side encapsulant , the insulating member (32, 32A-32D) includes a first surface on a side opposite the first solar cell , and a second surface on a side opposite the first surface, recesses and protrusions are formed in the first surface, recesses and protrusions are not formed in the second surface, the conductive light-reflective film is made of metal and is formed on the first surface of the insulating member (32, 32A-32D), the insulating member (32, 32A-32D) serving as a base material for the conductive light-reflective film , and the shape of the conductive light-reflective film conforming to the irregularities of the insulating member (32, 32A-32D). <EOS>