A capsule endoscope (1) according to the present invention includes an optical dome part (21) having a dome hemisphere part (21a) and a dome cylinder part (21b) formed of a transparent member, and a cylinder having at least one opened. An information acquisition member for acquiring subject information by fitting the dome cylindrical portion (21b) to the outer peripheral surface (22b) on the opening side of the case portion (22). The capsule-type housing (2) to be included, the surface (71a) that contacts the end surface (22d) of the opening of the case portion (22), and the cylindrical portion (44c) of the optical unit (4) that is an information acquisition member A positioning member (7) having an abutting surface (71b). 本発明にかかるカプセル型内視鏡（１）は、透明部材で形成されたドーム半球部（２１ａ）とドーム円筒部（２１ｂ）とを有する光学ドーム部（２１）と、少なくとも一方が開口した円筒形状のケース部（２２）と、を有し、ドーム円筒部（２１ｂ）がケース部（２２）の開口側の外周面（２２ｂ）に嵌合して被検体情報取得のための情報取得部材を内包するカプセル型の筐体（２）と、ケース部（２２）の開口の端面（２２ｄ）に当て付く面（７１ａ）と、情報取得部材である光学ユニット（４）の円筒部（４４ｃ）に当て付く面（７１ｂ）と、を有する位置決め部材（７）と、を備える。
