Was sufficiently expand the field of view range, the light distribution sufficient illumination light in the visual field range of an enlarged. In the most object-side objective lens unit (11) has a a meniscus lens of negative power convex surface directed toward the convex surface facing the object side is arranged to face the outer lens, the illumination unit (13), light source and having an illumination window member (19), the light source is disposed so as to surround the periphery of the lens, is formed in a substantially annular illumination window member surrounds the periphery of the lens, among the convex surface of the lens located on the image side of the outermost diameter portion through which the light beam, the light shielding member for shielding the incident illumination light to the objective lens unit between the illumination window member and the lens are arranged, the following conditional expressions (1) and ( to provide a capsule endoscope that satisfies 2). -10
