A capsule medical device includes: a power supply unit a capsule detection magnetic field generation unit configured to generate a capsule detection magnetic field, with which at least one of a position and a posture of the capsule medical device is detected, upon receiving electric power a state detection unit configured to detect a state of the capsule medical device a control unit configured to control power supply to the capsule detection magnetic field generation unit and a magnetic field response unit configured to respond to a guiding-magnetic field for guiding at least one of the position and the posture, wherein the state detection unit includes a guiding-magnetic field detector configured to detect at least one of a strength, a direction, and a gradient of the guiding-magnetic field, and the control unit controls the power supply in accordance with a detection result of the guiding-magnetic field detector.
