To prevent emitted light from entering an eye.SOLUTION: A light irradiation device applies light 200 to an object while an emitting part 101 from which the light 200 is emitted is pressed against the object, and the light irradiation device 100 comprises a light source 102, contact detection means 105 for detecting that the emitting part 101 is in contact with the object, pupil detection means 103 for detecting that a pupil of a user is present in other than an area to which the light is applied, and control means 104 for causing a predetermined amount of the light 200 to be emitted from the emitting part 101 only if the contact detection means 105 detects the contact and the pupil detection means 103 detects the pupil.SELECTED DRAWING: Figure 1【課題】出射された光が眼に入ることを防止する。【解決手段】光２００が出射される出射部１０１を対象物に押し当てた状態で対象物に光２００を照射する光照射装置であって、光源１０２と、出射部１０１が対象物に接触したことを検出する接触検出手段１０５と、使用者の瞳が光の照射領域以外に存在することを検出する瞳検出手段１０３と、接触検出手段１０５が接触を検出し、かつ、瞳検出手段１０３が瞳を検出した場合にのみ所定光量の光２００を出射部１０１から出射させる制御手段１０４とを備える光照射装置１００。【選択図】図１
