Image pickup unit of the present invention includes an objective lens unit, which is fixed on the light receiving surface of the image sensor, a cover glass that is rectangular or square, the adhered to the front surface of the cover glass, than the diagonal length of the cover glass circular optical member smaller diameter, said a circular fitting hole in which the optical member is fitted from the rear, the fixed holding frame to the objective lens unit, in said holding frame, projecting radially inward protrusions that, the disposed in front of the optical member, the rear end face of the first light shielding member, and the optical member blocks the field of view outside the light directed to the pixel forming region of the reflected image pickup device in the inner wall surface of the projecting portion the disposed between the front end surface of the cover glass, and a second light blocking member, which blocks the field of view outside the optical angle toward reflected the pixel forming region on the side surface of the optical member and the.本発明の撮像ユニットは、対物レンズユニット、撮像素子の受光面上に固定された、長方形又は正方形であるカバーガラス、前記カバーガラスの前端面に貼着された、前記カバーガラスの対角線長よりも小さい直径の円形の光学部材、前記光学部材が後方から嵌合する円形の嵌合孔を有し、前記対物レンズユニットに対して固定された保持枠、前記保持枠内において、径方向内側に突出する突出部、前記光学部材の前方に配設され、前記突出部の内壁面において反射し前記撮像素子の画素形成領域内に向かう視野外光を遮る第1遮光部材、及び前記光学部材の後端面と前記カバーガラスの前端面との間に配設され、前記光学部材の側面において反射し前記画素形成領域内に向かう角度の視野外光を遮る第2遮光部材、を備える。
