A light emitting device comprising: a substrate, a first substrate electrode and a second substrate electrode, both of which are disposed on the substrate; and an element having a rectangular shape, the element including a first element electrode and a second element electrode, which are formed inside an outer periphery of the element and aligned respectively with the first substrate electrode and the second substrate electrode via a heat-melted connecting material (kh), wherein at least a portion of an outer periphery of the first substrate electrode has an identical shape to a shape of at least a portion of an outer periphery of the first element electrode, at least a portion of an outer periphery of the second substrate electrode has an identical shape to a shape of at least a portion of an outer periphery of the second element electrode, the first substrate electrode includes a recessed concave portion, which is formed by cutting off a portion on the outer periphery of the first substrate electrode, a portion of the outer periphery of the second substrate electrode extends along the recessed concave portion of the first substrate electrode, the second substrate electrode being separated from the first substrate electrode, and the first substrate electrode includes a pair of opposed first sides and a pair of opposed second sides, characterized in that each of the first substrate electrode and the second substrate electrode includes two or more first extended sections (2b, 3b), each extending outwardly beyond the outer periphery of the element, a first extended section (2b, 3b) is formed at a center of each of first sides, and the recessed concave portion is formed at a center of each of the second sides, wherein the first extended section of the second substrate electrode is a portion, which extends outward outside the outer periphery of the element either in a way the portion is a part of an enlarged connecting area larger than the second element electrode aligned with the portion, or in a way the disposition of the second substrate electrode with respect to the recessed portion of the first substrate electrode is displaced outward from the position of the second substrate electrode aligned with the second element electrode. a substrate, a first substrate electrode and a second substrate electrode, both of which are disposed on the substrate; and an element having a rectangular shape, the element including a first element electrode and a second element electrode, which are formed inside an outer periphery of the element and aligned respectively with the first substrate electrode and the second substrate electrode via a heat-melted connecting material (kh), wherein at least a portion of an outer periphery of the first substrate electrode has an identical shape to a shape of at least a portion of an outer periphery of the first element electrode, at least a portion of an outer periphery of the second substrate electrode has an identical shape to a shape of at least a portion of an outer periphery of the second element electrode, the first substrate electrode includes a recessed concave portion, which is formed by cutting off a portion on the outer periphery of the first substrate electrode, a portion of the outer periphery of the second substrate electrode extends along the recessed concave portion of the first substrate electrode, the second substrate electrode being separated from the first substrate electrode, and the first substrate electrode includes a pair of opposed first sides and a pair of opposed second sides, characterized in that each of the first substrate electrode and the second substrate electrode includes two or more first extended sections (2b, 3b), each extending outwardly beyond the outer periphery of the element, a first extended section (2b, 3b) is formed at a center of each of first sides, and the recessed concave portion is formed at a center of each of the second sides, wherein the first extended section of the second substrate electrode is a portion, which extends outward outside the outer periphery of the element either in a way the portion is a part of an enlarged connecting area larger than the second element electrode aligned with the portion, or in a way the disposition of the second substrate electrode with respect to the recessed portion of the first substrate electrode is displaced outward from the position of the second substrate electrode aligned with the second element electrode.