Provided are a UV-transmitting glass having a high UV transmittance and good mechanical strength, and a UV irradiation device and UV sterilization device using the UV-transmitting glass. The UV-transmitting glass is a glass body having a surface compressive stress layer of 3-50 [mu]m from the surface in the depth direction, wherein the glass body has a transmittance of 70% or more with respect to a wavelength of 254 nm as measured by a spectral transmittance measurement with a thickness of 0.5 mm. The UV irradiation device uses the UV-transmitting glass, and the sterilization device uses the UV-transmitting glass.本發明之課題是提供一種紫外線穿透率高且機械強度良好之紫外線穿透玻璃、使用了該紫外線穿透玻璃之紫外線照射裝置及紫外線殺菌裝置。 解決手段上,本發明為一種紫外線穿透玻璃,其係一具有自表面起往深度方向3~50μm之表面壓縮應力層的玻璃體,且前述玻璃體於板厚0.5mm之分光穿透率測定時,波長254nm之穿透率為70%以上;本發明並為使用了該紫外線穿透玻璃之紫外線照射裝置及使用了該紫外線穿透玻璃之紫外線殺菌裝置。10‧‧‧紫外線殺菌裝置11‧‧‧紫外線光源12‧‧‧紫外線穿透構件13‧‧‧流路形成構件13a‧‧‧導入口13b‧‧‧導出口14‧‧‧封裝材料15‧‧‧纜線
