A light-emitting-device-integrated building material (1, 81, 201, 301, 401) that constitutes at least part of an external surface of a structure, comprising: a decorative member (2, 72, 82, 202, 302, 402), part of its outer surface constituting the external surface; and two or more of surface emitting panels (4, 104, 304) disposed in parallel such that each of their light emitting surfaces faces outward, the two or more of surface emitting panels constituting an inner light emitting section (3, 203), wherein the two or more of surface emitting panels comprises a first surface emitting panel and a second surface emitting panel, the first surface emitting panel and the second surface emitting panel being disposed adjacent to each other in a parallel direction, the first surface emitting panel and the second surface emitting panel being disposed in contact with each other or at an interval, wherein an inter-panel non-light emitting region (60, 160) is constituted between a light emitting surface of the first surface emitting panel and a light emitting surface of the second surface emitting panel, the inter-panel non-light emitting region including at least a boundary portion between the first surface emitting panel and the second surface emitting panel, or at least the interval, wherein the decorative member is disposed outside the inner light emitting section and across the light emitting surface of the first surface emitting panel, the inter-panel non-light emitting region, and the light emitting surface of the second surface emitting panel, and an outer surface of the decorative member including a projection plane overlapping region (α1) disposed outside the inter-panel non-light emitting region, characterised in that: the decorative member and the inner light emitting section satisfy a following condition: when an average value of luminance per unit area of the inter-panel non-light emitting region in a front view is indicated as A1, and an average value of luminance per unit area of the projection plane overlapping region is indicated as A2, a value of X1 in the following expression is 55 or more and 3000 or less, X 1 = A 2 / A 1 ∗ 100 − 100 wherein a plurality of second portions each having a refractive index different from that of an adjacent portion are provided inside the decorative member, and wherein at least one of the second portions has a planar portion extending in a direction that is different from a direction orthogonal to the outer surface of the decorative member, and that intersects with the outer surface of the decorative member. a decorative member (2, 72, 82, 202, 302, 402), part of its outer surface constituting the external surface; and two or more of surface emitting panels (4, 104, 304) disposed in parallel such that each of their light emitting surfaces faces outward, the two or more of surface emitting panels constituting an inner light emitting section (3, 203), wherein the two or more of surface emitting panels comprises a first surface emitting panel and a second surface emitting panel, the first surface emitting panel and the second surface emitting panel being disposed adjacent to each other in a parallel direction, the first surface emitting panel and the second surface emitting panel being disposed in contact with each other or at an interval, wherein an inter-panel non-light emitting region (60, 160) is constituted between a light emitting surface of the first surface emitting panel and a light emitting surface of the second surface emitting panel, the inter-panel non-light emitting region including at least a boundary portion between the first surface emitting panel and the second surface emitting panel, or at least the interval, wherein the decorative member is disposed outside the inner light emitting section and across the light emitting surface of the first surface emitting panel, the inter-panel non-light emitting region, and the light emitting surface of the second surface emitting panel, and an outer surface of the decorative member including a projection plane overlapping region (α1) disposed outside the inter-panel non-light emitting region, characterised in that: the decorative member and the inner light emitting section satisfy a following condition: when an average value of luminance per unit area of the inter-panel non-light emitting region in a front view is indicated as A1, and an average value of luminance per unit area of the projection plane overlapping region is indicated as A2, a value of X1 in the following expression is 55 or more and 3000 or less, X 1 = A 2 / A 1 ∗ 100 − 100 wherein a plurality of second portions each having a refractive index different from that of an adjacent portion are provided inside the decorative member, and when an average value of luminance per unit area of the inter-panel non-light emitting region in a front view is indicated as A1, and an average value of luminance per unit area of the projection plane overlapping region is indicated as A2, a value of X1 in the following expression is 55 or more and 3000 or less, X 1 = A 2 / A 1 ∗ 100 − 100 wherein a plurality of second portions each having a refractive index different from that of an adjacent portion are provided inside the decorative member, and wherein at least one of the second portions has a planar portion extending in a direction that is different from a direction orthogonal to the outer surface of the decorative member, and that intersects with the outer surface of the decorative member.