PROBLEM TO BE SOLVED: To provide a light irradiation device composed so that the operation of an irradiation part can be determined from light of the irradiation part, and cost increase by the addition of circuit configuration and the generation of restriction etc., of an installation space are alleviated upon achieving this determinable configuration.SOLUTION: The light irradiation device is provided with the irradiation part 6 which irradiates invisible light in a wavelength band in an invisible region, and a body 1 in which the irradiation part 6 is provided in one end, wherein the irradiation part 6 includes a light source 7 which emits invisible light and an irradiation entrance 11 to release the light emitted from the light source 7 to the exterior. The light source 7 is composed of an LED substrate module 8 on which a plurality of light emitting diodes are arranged, the irradiation part 6 has the visible light in a wavelength band of a visible region in a portion of an irradiation light released from the irradiation entrance 11, and in the irradiation direction L of the irradiation light, a slit 12 that discharges the visible light to the exterior is provided in a part backward from the irradiation entrance 11 of the irradiation part 6.COPYRIGHT: (C)2013,JPO&INPIT【課題】照射部の動作を照射部の光で判断可能な構成にし、且つこの判断可能な構成にするにあたって、回路構成の追加によるコスト増大や設置スペースの制限等の発生を軽減した光照射装置を提供する。【解決手段】本発明は、非可視領域の波長帯で非可視の光を照射する照射部6と、照射部6を一端に設けた本体1とを備えると共に、照射部6が、前記非可視の光を発する光源7と、光源7の発した光を外部に放出する照射口11とを備えた光照射装置であって、光源7を、複数の発光ダイオードを配置したLED基板モジュール8で構成し、照射部6が、照射口11から放出する照射光の一部に、可視領域の波長帯で可視の光を有し、前記照射光の照射方向Lにおいて、照射部6の照射口11より後方の部位に、前記可視の光を外部に放出するスリット12を設けた。【選択図】図1
