Elongate luminaire which extends along a longitudinal axis, having: • a lamp holder comprising a rear side and a front side, which extends longitudinally with respect to the longitudinal axis between two axially opposite end faces, • an elongate lamp for emitting light at least over the front side of the lamp holder, and • a support plate for fastening current-carrying luminaire components, wherein the lamp holder has on its front side a holding portion for supporting the lamp, wherein the lamp holder has an open insertion region of the holding portion on at least one of the end faces, via which the lamp can be slidingly inserted into the holding portion in an insertion direction oriented parallel to the longitudinal axis in order to be received therein in a form-fittingly supported manner perpendicular to the longitudinal axis, wherein the support plate has a fastening portion with which the support plate can be fastened to the rear side of the lamp holder, and wherein the support plate has a blocking portion which is designed in one piece together with the fastening portion and which, when the support plate is fastened to the rear side of the lamp holder via the fastening portion, extends at least partly in front of the insertion region in such a way as to secure the lamp received in the holding portion against sliding out of the holding portion via the insertion region counter to the insertion direction. • a lamp holder comprising a rear side and a front side, which extends longitudinally with respect to the longitudinal axis between two axially opposite end faces, • an elongate lamp for emitting light at least over the front side of the lamp holder, and • a support plate for fastening current-carrying luminaire components, wherein the lamp holder has on its front side a holding portion for supporting the lamp, wherein the lamp holder has an open insertion region of the holding portion on at least one of the end faces, via which the lamp can be slidingly inserted into the holding portion in an insertion direction oriented parallel to the longitudinal axis in order to be received therein in a form-fittingly supported manner perpendicular to the longitudinal axis, wherein the support plate has a fastening portion with which the support plate can be fastened to the rear side of the lamp holder, and wherein the support plate has a blocking portion which is designed in one piece together with the fastening portion and which, when the support plate is fastened to the rear side of the lamp holder via the fastening portion, extends at least partly in front of the insertion region in such a way as to secure the lamp received in the holding portion against sliding out of the holding portion via the insertion region counter to the insertion direction. wherein the lamp holder has on its front side a holding portion for supporting the lamp, wherein the lamp holder has an open insertion region of the holding portion on at least one of the end faces, via which the lamp can be slidingly inserted into the holding portion in an insertion direction oriented parallel to the longitudinal axis in order to be received therein in a form-fittingly supported manner perpendicular to the longitudinal axis, wherein the support plate has a fastening portion with which the support plate can be fastened to the rear side of the lamp holder, and wherein the support plate has a blocking portion which is designed in one piece together with the fastening portion and which, when the support plate is fastened to the rear side of the lamp holder via the fastening portion, extends at least partly in front of the insertion region in such a way as to secure the lamp received in the holding portion against sliding out of the holding portion via the insertion region counter to the insertion direction.