A solar battery comprising: solar cells; a wiring substrate; an adhesive agent for adhering said solar cells and said wiring substrate to each other; a transparent substrate provided on a light receiving surface side of said solar cells; and a sealing material filled between said transparent substrate and said wiring substrate to seal said solar cells; wherein each of said solar cells is a back-side electrode type solar cell having a p-electrode and an n-electrode on a rear surface side; said solar cells contain a first solar cell and a second solar cell, said first solar cell and said second solar cell being mutually adjacent; said wiring substrate includes an insulative base material and a wire for p-type, which is electrically connected to said p-electrode, a wire for n-type, which is electrically connected to said n-electrode, and a connection electrode of a conductive material formed on said insulative base material; each of said wire for p-type and said wire for n-type contains strip-shaped portions, said strip-shaped portion of said wire for p-type and said strip-shaped portion of said wire for n-type being arranged alternately; said connection electrode electrically connects said wire for p-type, which is connected to said p-electrode of said first solar cell, to said wire for n-type, which is connected to said n-electrode of said second solar cell; said adhesive agent is disposed on at least a part of a region of said insulative base material other than a region in which said wires (109, 110) are formed; and the p-electrode is in direct contact with the wire for p-type by mechanical compression bonding and the n-electrode is in direct contact with the wire for n-type by mechanical compression bonding. solar cells; a wiring substrate; an adhesive agent for adhering said solar cells and said wiring substrate to each other; a transparent substrate provided on a light receiving surface side of said solar cells; and a sealing material filled between said transparent substrate and said wiring substrate to seal said solar cells; wherein each of said solar cells is a back-side electrode type solar cell having a p-electrode and an n-electrode on a rear surface side; said solar cells contain a first solar cell and a second solar cell, said first solar cell and said second solar cell being mutually adjacent; said wiring substrate includes an insulative base material and a wire for p-type, which is electrically connected to said p-electrode, a wire for n-type, which is electrically connected to said n-electrode, and a connection electrode of a conductive material formed on said insulative base material; each of said wire for p-type and said wire for n-type contains strip-shaped portions, said strip-shaped portion of said wire for p-type and said strip-shaped portion of said wire for n-type being arranged alternately; said connection electrode electrically connects said wire for p-type, which is connected to said p-electrode of said first solar cell, to said wire for n-type, which is connected to said n-electrode of said second solar cell; said adhesive agent is disposed on at least a part of a region of said insulative base material other than a region in which said wires (109, 110) are formed; and the p-electrode is in direct contact with the wire for p-type by mechanical compression bonding and the n-electrode is in direct contact with the wire for n-type by mechanical compression bonding.