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 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 for receiving the light source placement portion ; a power supply terminal that extends from the attachment main body to the attachment opening ; and a first rib that extends from the attachment main body to the attachment opening , wherein the first rib 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 , 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 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 for receiving the light source placement portion ; a power supply terminal that extends from the attachment main body to the attachment opening ; and a first rib that extends from the attachment main body to the attachment opening , wherein the first rib 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 , 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 for receiving the light source placement portion ; a power supply terminal that extends from the attachment main body to the attachment opening ; and a first rib that extends from the attachment main body to the attachment opening , wherein the first rib 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 , 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 . <EOS>