A capsule medical device introduced into a subject includes an illuminating unit that illuminates inside of the subject; an imaging unit that captures an image of inside the subject illuminated by the illuminating unit; an optical unit including a lens group that forms the image of inside the subject illuminated by the illuminating unit onto a light receiving surface of the imaging unit and a lens frame for holding the lens group; and an illuminating board having a bending part extending to a part of an outer circumference and an opening part capable of inserting the lens frame thereinto formed thereon, and having the illuminating unit mounted thereon. At least one of the opening part and the lens frame has a shape capable of avoiding a contact between the illuminating board, which turns while bending the bending part, and an upper end of the lens frame.