The present invention is directed to a dielectric barrier discharge lamp capable of recovering reduced radiation efficiency by easily, quickly cleaning dust or discoloring of a discharge tube or replacing any defective discharge tube. For this end, an internal electrode 22 in a form of electrically conductive rod is inserted into a center hole of a dual discharge tube 20 having discharge gas filled in an internal space 21. Holders 40a and 40b are removably mounted on both ends of the internal electrode 22 using mounting screws 41. A protection tube 30 is mounted onto the holders 40 by way of sealing members 31, pressure blocks 32 and pressure rings 33 in such a manner to cover an external electrode 23 of the discharge tube 20. Cooling water or the like may be permitted to flow in a continuous space 45 formed between the internal electrode 22 and the discharge tube 20 and the holders 40.