An automotive lamp comprising: a light source; a placement member that is provided with a light source placement portion on which the light source is placed; and a power supply attachment (30, 130, 230, 330, 430, 530) structured to provide electrical connection to the light source and to fix the light source to the light source placement portion on the placement member, the power supply attachment comprising: an attachment main body that is provided with an attachment bottom surface that comes into contact with the placement member, and has an attachment opening (42, 242, 342) for receiving the light source placement portion; a power supply terminal (34, 134, 234, 334) that extends from the attachment main body to the attachment opening (42, 242, 342); and a first rib (36, 136, 236, 336) that extends from the attachment main body to the attachment opening (42, 242, 342), wherein the first rib (36, 136, 236, 336) is provided with a first rib distal end surface, a first rib upper surface, a first rib bottom surface that becomes closer to the attachment bottom surface than the power supply terminal (34, 134, 234, 334), characterized by a first rib distal end inclined surface that connects the first rib bottom surface to the first rib distal end surface, the first rib distal end surface that connects the first rib distal end inclined surface to the first rib upper surface and is perpendicular to the first rib upper surface, the first rib distal end inclined surface inclined relative to both of the first rib bottom surface and the first rib distal end surface. a light source; a placement member that is provided with a light source placement portion on which the light source is placed; and a power supply attachment (30, 130, 230, 330, 430, 530) structured to provide electrical connection to the light source and to fix the light source to the light source placement portion on the placement member, the power supply attachment comprising: an attachment main body that is provided with an attachment bottom surface that comes into contact with the placement member, and has an attachment opening (42, 242, 342) for receiving the light source placement portion; a power supply terminal (34, 134, 234, 334) that extends from the attachment main body to the attachment opening (42, 242, 342); and a first rib (36, 136, 236, 336) that extends from the attachment main body to the attachment opening (42, 242, 342), wherein the first rib (36, 136, 236, 336) is provided with a first rib distal end surface, a first rib upper surface, a first rib bottom surface that becomes closer to the attachment bottom surface than the power supply terminal (34, 134, 234, 334), characterized by a first rib distal end inclined surface that connects the first rib bottom surface to the first rib distal end surface, the first rib distal end surface that connects the first rib distal end inclined surface to the first rib upper surface and is perpendicular to the first rib upper surface, the first rib distal end inclined surface inclined relative to both of the first rib bottom surface and the first rib distal end surface. an attachment main body that is provided with an attachment bottom surface that comes into contact with the placement member, and has an attachment opening (42, 242, 342) for receiving the light source placement portion; a power supply terminal (34, 134, 234, 334) that extends from the attachment main body to the attachment opening (42, 242, 342); and a first rib (36, 136, 236, 336) that extends from the attachment main body to the attachment opening (42, 242, 342), wherein the first rib (36, 136, 236, 336) is provided with a first rib distal end surface, a first rib upper surface, a first rib bottom surface that becomes closer to the attachment bottom surface than the power supply terminal (34, 134, 234, 334), characterized by a first rib distal end inclined surface that connects the first rib bottom surface to the first rib distal end surface, the first rib distal end surface that connects the first rib distal end inclined surface to the first rib upper surface and is perpendicular to the first rib upper surface, the first rib distal end inclined surface inclined relative to both of the first rib bottom surface and the first rib distal end surface.