In order to realize a capsule-type medical device suitable for improving efficiency of wireless transmission/reception using an antenna to increase radiowave power, a capsule-type medical device is configured so as to comprise an image-capturing illumination unit in which an illumination optical system and an image-capturing unit are provided as a function executing unit for executing a predetermined function within a subject to be examined, an RF unit serving as a wireless unit for communicating a signal generated by this image-capturing illumination unit being driven, or a signal for controlling driving of the image-capturing illumination unit with the outside of the subject to be examined wirelessly, and an antenna, which is provided in this RF unit, including a pair of antenna elements formed in a tubular shape for covering the outer circumference of the image-capturing illumination unit.