PROBLEM TO BE SOLVED: To surely perform fixation of an image sensor without inhibiting miniaturization of an endoscope.SOLUTION: On an axial direction end surface of a cylindrical optical member holder for holding an optical element for forming an image on a light receiving surface of an image sensor, an outer peripheral edge part of the outside of the light receiving surface of the image sensor is adhered. On the axial direction end surface, an opening is provided formed in a shape substantially along an edge of the light receiving surface. As a portion toward the outside of the light receiving surface out of light leading to the image sensor by passing through a lens does not contribute to image formation on the light receiving surface, by forming the opening for allowing the light leading to the image sensor from the optical element to pass through into the shape substantially along the edge of the light receiving surface of the image sensor, the size of the opening can be minimized while securing the size necessary for the image formation on the light receiving surface. Thereby, a wide area can be secured for adhering the image sensor on the axial direction end surface.COPYRIGHT: (C)2015,JPO&INPIT【課題】内視鏡の小型化を阻害することなく、イメージセンサの固定を確実に行う。【解決手段】イメージセンサの受光面に結像させるための光学素子を保持する円筒状の光学部材ホルダの軸線方向端面に、イメージセンサの前記受光面の外側の外周縁部を接着させる。軸線方向端面には、受光面の縁に概ね沿った形状に形成された開口を設ける。レンズを通過してイメージセンサに至る光の内で受光面の外側に向かう部分は受光面での結像に寄与しないことから、光学素子からイメージセンサに至る光を通過させるための開口を、イメージセンサの受光面の縁に概ね沿った形状に形成することにより、受光面への結像に必要な大きさを確保しつつ開口の大きさをできるだけ小さくすることができ、それにより、軸線方向端面におけるイメージセンサを接着するための面積を広く取ることができる。【選択図】図7
