A solar cell module, comprising: solar cell strings arranged side by side in a widthwise direction, each of the solar cell strings including solar cells arranged side by side in a lengthwise direction, and a tab wiring member electrically connecting at least some of the solar cells to each other; an interconnection wiring member electrically connecting at least some of the solar cell strings to each other; a front surface member; a light-receiving-side filler member filled between the front surface member and the solar cell strings; and a back surface member; wherein each of the solar cells includes on its front surface a busbar electrode extending in the lengthwise direction, and a distance between the solar cells in each of the solar cell strings is larger than a distance between the solar cell strings, characterized in that a reflective filler member formed of resin material is filled between the back surface member and the solar cell strings, provided on back surface sides of the solar cell strings and is in contact with the back surface of the solar cells and provided between adjacent solar cells in each of the solar cell strings and between adjacent solar cell strings, wherein a height of the reflective filler member between the solar cells in each of the solar cell strings is larger than a height of the reflective filler member between the solar cell strings, such that a distance (d 1) between the reflective filler member and the front surface member between solar cells in each of the solar cell strings is smaller than a distance (d 2) between the reflective filler member and front surface member between the solar cell strings, wherein the reflective filler member is provided between the solar cells in each of the solar cell strings in such a way as to cover peripheral portions of the front surface of each of the solar cells, and an amount covered by the reflective filler member between the solar cells in each of the solar cell strings is larger than an amount covered by the reflective filler member between the solar cell strings. solar cell strings arranged side by side in a widthwise direction, each of the solar cell strings including solar cells arranged side by side in a lengthwise direction, and a tab wiring member electrically connecting at least some of the solar cells to each other; an interconnection wiring member electrically connecting at least some of the solar cell strings to each other; a front surface member; a light-receiving-side filler member filled between the front surface member and the solar cell strings; and a back surface member; wherein each of the solar cells includes on its front surface a busbar electrode extending in the lengthwise direction, and a distance between the solar cells in each of the solar cell strings is larger than a distance between the solar cell strings, characterized in that a reflective filler member formed of resin material is filled between the back surface member and the solar cell strings, provided on back surface sides of the solar cell strings and is in contact with the back surface of the solar cells and provided between adjacent solar cells in each of the solar cell strings and between adjacent solar cell strings, wherein a height of the reflective filler member between the solar cells in each of the solar cell strings is larger than a height of the reflective filler member between the solar cell strings, such that a distance (d 1) between the reflective filler member and the front surface member between solar cells in each of the solar cell strings is smaller than a distance (d 2) between the reflective filler member and front surface member between the solar cell strings, wherein the reflective filler member is provided between the solar cells in each of the solar cell strings in such a way as to cover peripheral portions of the front surface of each of the solar cells, and an amount covered by the reflective filler member between the solar cells in each of the solar cell strings is larger than an amount covered by the reflective filler member between the solar cell strings.