A distal end body portion having a forward opening, a rear opening and a side opening, and a placement space, the assembly method of the endoscope imaging unit, the top lens of the outer diameter which is substantially fitted to the front opening a lens unit which includes, to fit into the rear opening, and an imaging unit including an imaging device disposed in an imaging position of the lens system of the lens portion or the like, the arrangement space of the lens unit from the side opening It comprises inserting step of inserting a fitting step of fitting the front opening of the lens portion is inserted, the imaging unit fitting step of fitting the rear opening, the imaging unit from the rear of the rear opening.内視鏡撮像ユニットの組立方法は、前方開口部、側方開口部及び後方開口部と、配置空間部とを有する先端部本体部と、前方開口部に略嵌合する外径の先端レンズを含むレンズ部と、後方開口部に嵌合し、レンズ部等のレンズ系による結像位置に配置される撮像素子を備えた撮像部とを備え、側方開口部からレンズ部を配置空間部に挿入する挿入ステップ、挿入されたレンズ部を前方開口部に嵌合させる嵌合ステップ、後方開口部の後方から撮像部を、後方開口部に嵌合させる撮像部嵌合ステップ、を具備する。
