A luminaire into which a light-emitting module is attached, comprising: a luminaire body including a depression that includes a round opening, wherein the light-emitting module includes a substrate that is substantially round and plate-like, wherein a hole is provided in the substrate that penetrates through to a reverse side and wherein a notch is formed on a portion of an outer edge of the substrate of the light-emitting module, characterized in that the luminaire body includes a pin provided to extend from a bottom face of the depression, a protrusion provided on a side wall of the depression to extend toward the radial inner side of the depression, and two flexible feed terminals (213, 214) that extend from the side wall of the depression toward a radial inner side of the depression, wherein when the light-emitting module is being attached, a first main surface of the substrate is in contact with the bottom face of the depression, and when the light-emitting module is being attached, the hole in the substrate functions as a guide for the pin, and the pin is inserted in the hole, wherein, in order to ensure the accuracy of the position of the substrate with respect to the luminaire body, the notch in the substrate functions as a guide for the protrusion, and the protrusion is inserted into the notch, wherein the two flexible feed terminals (213, 214) are cranked, so as to be connected to two module terminals (130, 140) formed in a second main face of the substrate opposite the first main surface of the substrate in the light-emitting module, wherein the contact of the two flexible feed terminals (213, 214) and the two module terminals (130, 140) is achieved by an O-shaped ring and a ring-shaped screw. a luminaire body including a depression that includes a round opening, wherein the light-emitting module includes a substrate that is substantially round and plate-like, wherein a hole is provided in the substrate that penetrates through to a reverse side and wherein a notch is formed on a portion of an outer edge of the substrate of the light-emitting module, characterized in that the luminaire body includes a pin provided to extend from a bottom face of the depression, a protrusion provided on a side wall of the depression to extend toward the radial inner side of the depression, and two flexible feed terminals (213, 214) that extend from the side wall of the depression toward a radial inner side of the depression, wherein when the light-emitting module is being attached, a first main surface of the substrate is in contact with the bottom face of the depression, and when the light-emitting module is being attached, the hole in the substrate functions as a guide for the pin, and the pin is inserted in the hole, wherein, in order to ensure the accuracy of the position of the substrate with respect to the luminaire body, the notch in the substrate functions as a guide for the protrusion, and the protrusion is inserted into the notch, wherein the two flexible feed terminals (213, 214) are cranked, so as to be connected to two module terminals (130, 140) formed in a second main face of the substrate opposite the first main surface of the substrate in the light-emitting module, wherein the contact of the two flexible feed terminals (213, 214) and the two module terminals (130, 140) is achieved by an O-shaped ring and a ring-shaped screw.