A capsule medical device includes: a casing having a capsule shape a plurality of batteries, each having a first face, a second face, a first electrode and a second electrode and a short-circuit prevention member, wherein the short-circuit prevention member includes an insulating member having an annular shape, covering the portion of the second electrode, and formed with an aperture from which the first electrode is exposed, an outer diameter of the annular shape is smaller than an inner diameter of the casing, and larger than an outer diameter of the battery, and a diameter of the aperture is larger than a diameter of the first electrode, and smaller than a diameter of the portion of the second electrode.
