PROBLEM TO BE SOLVED: To suppress a wasteful space to achieve downsizing by increasing space efficiency in an insertion tip face, and easily fix a lens and an imaging element with high strength.SOLUTION: A tip 15 of an endoscope includes: a single lens 93 whose outer shape in a vertical direction with respect to the center of the lens is quadrangular； a sheath 61 arranged coaxially with the center of the lens to surround the lens 93, whose outer periphery is circular； and a light guide 57 arranged between the outer periphery of the sheath 61 and at least one side of the lens 93, which extends along the center of the lens.SELECTED DRAWING: Figure 24【課題】挿入先端面におけるスペース効率を高めて無駄なスペースを抑制できることで小型化を図り、レンズと撮像素子とを容易に高強度で固定できる。【解決手段】内視鏡の先端部１５において、レンズ中心に対して垂直方向の外形状が四角形の単一のレンズ９３と、レンズ中心と同軸に配置されてレンズ９３を包囲し、その外周が円形のシース６１と、シース６１の外周とレンズ９３の少なくとも１辺との間に配置されレンズ中心に沿って延在するライトガイド５７と、を設けた。【選択図】図２４
