A capsule medical device (1) includes a capsule casing (2) that contains an illumination board (3b), an imaging board (5b), a transmission board (6c), and a control board (7c) on which functional components are mounted, and a sheet-like battery (8) that supplies power to the functional components. The sheet-like battery (8) is rolled up to be a pole shape and located between cutout parts (10a, 10b, 10c) of the imaging board (5b), the transmission board (6c), and the control board (7c) and the inner wall of the capsule casing (2).
