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).