When combining white illumination light and narrowband light, the emission angles of two types of light are made uniform and light is efficiently used while suppressing an increase in manufacturing cost. A light source device according to the present disclosure combines a white illumination light source that emits white illumination light, one or more narrow band light sources that emit narrow band light, and the white illumination light and the narrow band light. A multiplexing optical system, and a condensing optical system that couples the combined white illumination light and narrowband light to a light guide that is provided in the image acquisition device and guides the illumination light into the image acquisition device. A light amount distribution adjusting element that is provided on the optical axis between the narrow band light source and the combining optical system and adjusts the light amount distribution of the narrow band light, and the light guide is bundled with multimode optical fibers. Bundle type light guide, or a liquid light guide filled with liquid inside, the light amount distribution adjusting element, so that the radiation angle distribution of the narrow band light transmitted through the light amount distribution adjusting element has anisotropy, Adjust the light distribution of narrowband light. [Selection] Figure 6【課題】白色照明光と狭帯域光とを合波する際に、製造コストの増加を抑制しつつ、２種類の光の放射角を均一化し、光を効率良く利用すること。【解決手段】本開示に係る光源装置は、白色照明光を出射する白色照明光源と、狭帯域光を出射する１又は複数の狭帯域光源と、白色照明光と狭帯域光とを合波する合波光学系と、合波後の白色照明光及び狭帯域光を、画像取得装置に設けられた、当該画像取得装置内に照明光を導光するライトガイドへと結合させる集光光学系と、狭帯域光源と合波光学系との間の光軸上に設けられ、狭帯域光の光量分布を調整する光量分布調整素子と、を備え、ライトガイドは、マルチモード光ファイバが束ねられたバンドル式ライトガイド、又は、内部に液体が充填された液体ライトガイドであり、光量分布調整素子は、当該光量分布調整素子を透過した狭帯域光の放射角分布が異方性を有するように、狭帯域光の光量分布を調整する。【選択図】図６
