PROBLEM TO BE SOLVED: To provide an optical unit which is constituted in such a way that an optical axis is decentered from the outer diameter center of a cylindrical member, and which nonetheless can hold high durability against high-temperature environment, and to provide an endoscope and a production method of the optical unit.SOLUTION: An optical unit 200 includes a cylindrical member 51 having wall thicknesses different in the circumferential direction, and a translucent member 53 provided at one axial end side of the cylindrical member. The optical unit further includes a joining member 85 that joins the translucent member 53 and the cylindrical member 51 together and seals one axial end side of the cylindrical member. The thickness of the joining member 85 at a part where a lateral side 81 of the translucent member and an inner peripheral face 83 of the cylindrical member are joined is configured in such a way that the thickness at a large wall-thickness region (thickness t1) of the cylindrical member is larger than a small wall-thickness region (thickness t2) thereof.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2016,JPO&INPIT【課題】光軸を筒状部材の外径中心から偏心させた構成であっても、高温環境に対する高い耐久性を保持できる光学ユニット、内視鏡、及び光学ユニットの製造方法を提供する。【解決手段】光学ユニット200は、周方向に肉厚が異なる筒状部材51と、筒状部材の軸方向一端側に設けられる透光性部材53とを有し、さらに透光性部材53と筒状部材51とを接合し、筒状部材の軸方向一端側を封止する接合部材85を備える。透光性部材の側面81と筒状部材の内周面83とを接合している部位における接合部材85の厚さは、筒状部材の肉厚が大きい部位(厚さt1)における厚さが、肉厚が小さい部位(厚さt2)における厚さよりも厚い。【選択図】図4
