To provide an improved dielectric barrier discharge lamp, a dielectric barrier discharge lamp device and ultraviolet ray irradiating device using this by mounting an external electrode of mesh structure on an airtight vessel so as not to be inadvertently fallen or slipped while keeping a simple structure to improve the prior proposal by the present inventors.

This dielectric barrier discharge lamp comprises a tubular airtight vessel 1 consisting of an ultraviolet ray transmittable material and having exhaust chip 1c on the side surface, an excimer generating gas sealed therein, an internal electrode 2 sealed in the airtight vessel 1, and an external electrode 4 of mesh structure engagingly locked by the exhaust chip 1c in contact with the circumference of the airtight vessel 1. When knitbraided structure is adapted as the mesh structure of the external electrode 4 to form a cylindrical body having a large diameter to the airtight vessel 1, and both the ends of the cylindrical body are pulled after inserting the airtight vessel 1 to the inner part thereof, the knitbraided structure is elongated, deformed, contracted, and closely fitted to the airtight vessel 1, and engagingly locked by the exhaust chip 1C. A dielectric barrier discharge lamp device is formed of this dielectric barrier discharge lamp and a high frequency generating means.