A light emitting device comprising: a mounting board; one or more light emitting elements mounted on the mounting board; a frame configured by using a resin material and arranged to surround the one or more light emitting elements; and a light transmissive member encapsulating an area surrounded by the frame, wherein the frame has an inner perimeter that includes a first side, a second side that is opposed to the first side, a third side that is adjacent to the first and second sides (32a, 32b), and a fourth side that is opposed to the third side and adjacent to the first and second sides (32a, 32b), characterized in that: the frame has, in a plan view thereof, four acute-angled portions, as corners of the frame, that are formed, respectively, by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the fourth side, and by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the fourth side, a rectangular region is defined within the frame as a region having four sides and four corners, the four sides respectively being in contact with the first, second, third, and fourth sides (32a, 32b, 34a, 34b) of the frame, and the four acute-angled portions of the frame being located on an outside of the four corners of the rectangular region, and the first, second, third, and fourth sides (32a, 32b, 34a, 34b) each includes a straight-lined portion. a mounting board; one or more light emitting elements mounted on the mounting board; a frame configured by using a resin material and arranged to surround the one or more light emitting elements; and a light transmissive member encapsulating an area surrounded by the frame, wherein the frame has an inner perimeter that includes a first side, a second side that is opposed to the first side, a third side that is adjacent to the first and second sides (32a, 32b), and a fourth side that is opposed to the third side and adjacent to the first and second sides (32a, 32b), characterized in that: the frame has, in a plan view thereof, four acute-angled portions, as corners of the frame, that are formed, respectively, by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the fourth side, and by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the fourth side, a rectangular region is defined within the frame as a region having four sides and four corners, the four sides respectively being in contact with the first, second, third, and fourth sides (32a, 32b, 34a, 34b) of the frame, and the four acute-angled portions of the frame being located on an outside of the four corners of the rectangular region, and the first, second, third, and fourth sides (32a, 32b, 34a, 34b) each includes a straight-lined portion. the frame has, in a plan view thereof, four acute-angled portions, as corners of the frame, that are formed, respectively, by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the third side, by a side of the frame located on an extension of the second side and a side of the frame located on an extension of the fourth side, and by a side of the frame located on an extension of the first side and a side of the frame located on an extension of the fourth side, a rectangular region is defined within the frame as a region having four sides and four corners, the four sides respectively being in contact with the first, second, third, and fourth sides (32a, 32b, 34a, 34b) of the frame, and the four acute-angled portions of the frame being located on an outside of the four corners of the rectangular region, and the first, second, third, and fourth sides (32a, 32b, 34a, 34b) each includes a straight-lined portion.