Problem to be solved: to switch the wavelength band of the irradiation light and to obtain a high quality observation image.A first light source section for emitting broadband light andA second light source section for emitting narrow-band light in a wavelength band narrower than said broadband lightA radiation angle changing member for generating a secondary light source by changing the radiating angle of said narrow-band light emitted from the second light source portion andA multiplicity member which is coupled with said narrow-band light emitted from said first light source and said narrow-band light emitted from said secondary light sourceEquipped withThe radiation angle changing member isThe incident angle of the wideband light and the narrow-band light approaches the incident end surface of the light guide incident by the light that has been multiplexed by the said coupling memberChange the radiant angle of the narrowband lightProvide an illumination device.Diagram【課題】照射光の波長帯域を切り替えることと、より高品質な観察像を得ることと、を両立させる。【解決手段】広帯域光を出射する第１の光源部と、前記広帯域光より狭い波長帯域の狭帯域光を出射する第２の光源部と、前記第２の光源部から出射された前記狭帯域光の放射角度を変更することにより２次光源を生成する放射角度変更部材と、前記第１の光源部から出射された前記広帯域光と前記２次光源から出射された前記狭帯域光とを合波する合波部材と、を備え、前記放射角度変更部材は、前記合波部材により合波された光が入射するライトガイドの入射端面において前記広帯域光と前記狭帯域光との入射角が近づくように、前記狭帯域光の放射角度を変更する、照明装置を提供する。【選択図】図１
