A capsule type medical device, including: a capsule shaped casing which can be ingested to within the living body; an electrical stimulation device which comprises a plurality of electrodes which are used for applying electrical stimuli to living body tissue; an electrode selection device which selects an electrode from among the plurality of electrodes, to apply an electrical stimulus; a contact detection device which electrically detects the electrode which is in contact with the living body tissue; and a control section which controls the various devices.