PROBLEM TO BE SOLVED: To provide an optical guide assembly including a main body, an optical guide at least a part of which is incorporated into a side wall of the main body, and a light source binding seat attached to an end of the optical guide.SOLUTION: An end of a binding seat 20 of an optical guide 30 includes a first portion 31 of an end part, a narrowing part 32 connected to the first portion, and a second portion 33 connected to the narrowing part. A long diameter of a cross section of the optical guide decreases from the first portion side of the narrowing part to the second portion side of the narrowing part.SELECTED DRAWING: Figure 2【課題】本体と、本体の側壁に少なくとも一部が組み込まれる光ガイドと、光ガイドの端に取り付けられる光源結合座とを備える光ガイドアセンブリを提供する。【解決手段】光ガイド３０の結合座２０の端は、端部の第一部分３１と、第一部分に接続される狭窄部位３２と、狭窄部位に接続される第二部分３３とを備え、光ガイドの断面の長径は、狭窄部位の第一部分側から狭窄部位の第二部分側まで減少する。【選択図】図２
