An electronic device comprising: a shift register electronic circuit provided integrally with a substrate; and a test circuit provided with the substrate and arranged outside the electronic circuit; wherein the test circuit comprises: switching sections (13a, 13b, 13c) a first line, adapted to be connected on one end with a connection terminal adapted to being electrically connected with an outside device, and said first line being further connected to a plurality of second lines on the other end; second lines (12a, 12b, 12c), each crossing the electronic circuit and each connectable to the first line via a switching section (13a, 13b, 13c) on a first end part and connectable to a predetermined extraction target within the electronic circuit via a leading line (GEc) on a second end part; the second end part of each second line (12a, 12b, 12c) being connectable to a respective leading line (GEc) by laser welding, each switching section (13a, 13b, 13c) comprising a branch line (GEa) connected to the first line, and two or more cross lines (SEa) connected to the respective second line (12a, 12b, 12c) and crossing the branch line (GEa) with an insulating film disposed between the branch line (GEa) and the two or more cross lines (SEa); so that, in each switching section, the first line and the respective second line can be switched between an electrical connected condition and an electrical disconnected condition by performing laser welding at an intersection of the branch line (GEa) and a cross line (SEa), the electrical conditions being changeable for a predetermined number of times corresponding to the number of cross lines (SEa) within the switching section. a shift register electronic circuit provided integrally with a substrate; and a test circuit provided with the substrate and arranged outside the electronic circuit; wherein the test circuit comprises: switching sections (13a, 13b, 13c) a first line, adapted to be connected on one end with a connection terminal adapted to being electrically connected with an outside device, and said first line being further connected to a plurality of second lines on the other end; second lines (12a, 12b, 12c), each crossing the electronic circuit and each connectable to the first line via a switching section (13a, 13b, 13c) on a first end part and connectable to a predetermined extraction target within the electronic circuit via a leading line (GEc) on a second end part; the second end part of each second line (12a, 12b, 12c) being connectable to a respective leading line (GEc) by laser welding, each switching section (13a, 13b, 13c) comprising a branch line (GEa) connected to the first line, and two or more cross lines (SEa) connected to the respective second line (12a, 12b, 12c) and crossing the branch line (GEa) with an insulating film disposed between the branch line (GEa) and the two or more cross lines (SEa); so that, in each switching section, the first line and the respective second line can be switched between an electrical connected condition and an electrical disconnected condition by performing laser welding at an intersection of the branch line (GEa) and a cross line (SEa), the electrical conditions being changeable for a predetermined number of times corresponding to the number of cross lines (SEa) within the switching section. switching sections (13a, 13b, 13c) a first line, adapted to be connected on one end with a connection terminal adapted to being electrically connected with an outside device, and said first line being further connected to a plurality of second lines on the other end; second lines (12a, 12b, 12c), each crossing the electronic circuit and each connectable to the first line via a switching section (13a, 13b, 13c) on a first end part and connectable to a predetermined extraction target within the electronic circuit via a leading line (GEc) on a second end part; the second end part of each second line (12a, 12b, 12c) being connectable to a respective leading line (GEc) by laser welding, each switching section (13a, 13b, 13c) comprising a branch line (GEa) connected to the first line, and two or more cross lines (SEa) connected to the respective second line (12a, 12b, 12c) and crossing the branch line (GEa) with an insulating film disposed between the branch line (GEa) and the two or more cross lines (SEa); so that, in each switching section, the first line and the respective second line can be switched between an electrical connected condition and an electrical disconnected condition by performing laser welding at an intersection of the branch line (GEa) and a cross line (SEa), the electrical conditions being changeable for a predetermined number of times corresponding to the number of cross lines (SEa) within the switching section.