LIGHT EMITTING ELEMENT-ACCOMMODATING MEMBER, ARRAY MEMBER, AND LIGHT EMITTING DEVICE

A light-emitting-element mounting housing member 1 includes: a bottom base material 7 that includes, on a first surface 7a, a mounting part 12 on which a light emitting element 3 is to be mounted; and a frame member 9 that is constituted of side walls 9a, 9b, 9c, and 9d erected on the first surface 7a to surround the mounting part 12, wherein the side walls 9a, 9b, 9c, and 9d are arranged so as to surround the mounting part 12, the frame member 9 includes an opening 15 that penetrates through one of the side walls 9a, 9b, 9c, and 9d, the opening 15 includes, as an inner edge 15A, a first side 15a and a second side 15c, the first side 15a extends along the first surface 7a and is arranged at a position close to the bottom base material 7, and the second side 15c extends along the first surface 7a and is arranged at a position far from the bottom base material 7, and the second side 15c is longer than the first side 15a. An array member 100 is obtained by connecting a plurality of light-emitting-element housing members 101A with each other. A light emitting device A includes the light emitting elements 3 mounted on the mounting parts 12 of the light-emitting-element housing members 101A.