An object of the present invention is that a lens frame of an optical unit that forms images of inside a subject on a light receiving surface of an imaging unit can be easily inserted into an opening part of an illuminating board having an illuminating unit that illuminates the inside of the subject mounted thereon. A capsule medical device according to the present invention includes optical units 4 and 7 that form the images of inside the subject onto light receiving surfaces of solid-state imaging devices 5 and 8, respectively, and illuminating boards 19a and 19f having opening parts, respectively, for inserting lens frames 4d and 7d of the optical units 4 and 7 thereinto formed thereon, respectively. The lens frames 4d and 7d each have a tapered external shape with an upper end being tapered, and the lens frames are inserted into the opening parts of the illuminating boards 19a and 19f from the tapered upper ends, respectively.
