To provide an ultraviolet (deep ultraviolet) light emitting device and an ultraviolet irradiation device having a hermetic sealing member whose bonding (sealing) temperature is lowered. SOLUTION: The deep ultraviolet LED element 5 is mounted on the submount 6 in the recess 1a of the LTCC substrate 1 and a deep UV transmission window member 10 is provided on the upper part of the LTCC substrate 1 so as to cover the recess 1a of the LTCC substrate 1 . A three dimensional network structure vanadium type low melting point glass layer 11 as a hermetically sealing member is provided between the upper portion of the LTCC substrate 1 and the deep ultraviolet ray transmitting window member 10 and a three dimensional network structure vanadium type low melting point glass layer 11 and a deep ultraviolet ray A metal layer 12 as a reflection layer is provided between the transparent window member 10 and the transparent window member 10. (FIG.【課題】接着(封止)温度を低下させた気密封止部材を有する紫外線(深紫外線)発光装置及び紫外線照射装置を提供する。【解決手段】LTCC基板1の凹部1a内のサブマウント6上に深紫外線LED素子5を搭載し、LTCC基板1の凹部1aを覆うようにLTCC基板1の上部に深紫外線透過窓部材10を設ける。LTCC基板1の上部と深紫外線透過窓部材10との間に気密封止部材としての三次元網目構造バナジウム系低融点ガラス層11を設け、三次元網目構造バナジウム系低融点ガラス層11と深紫外線透過窓部材10との間に反射層としての金属層12を設ける。【選択図】 図2
