A capsule endoscope system comprising: J A binocular capsule endoscope device comprising: an illumination unit (229a, 229b) configured to illuminate a living tissue; two imaging systems (A, B) respectively having different focal distances, each imaging system (A, B) having an imaging unit (220a, 220b) configured to capture an image of the living tissue; a transmission unit configured to transmit imaging information containing the image captured by the imaging unit (220a, 220b); a storage unit configured to store a threshold with respect to information on a distance between the capsule endoscope device and the living tissue; a detection unit configured to detect the information on the distance between the capsule endoscope device and the living tissue on the basis of the captured image; a battery; a ballast provided on the opposite side with respect to the battery; a controller configured to compare the information on the distance detected by the detection unit with the threshold, select a focal distance based on a result of the comparing, and select one of the two image systems according to the selected focal distance; characterised in that the ballast is movable and the binocular capsule endoscope device further comprises a ballast driver formed of a shape memory alloy, SMA, and configured to compress and extend in a longitudinal direction of the binocular capsule endoscope device to move the movable ballast thereby rotating the capsule endoscope device and changing to the selected image system. J A binocular capsule endoscope device comprising: an illumination unit (229a, 229b) configured to illuminate a living tissue; two imaging systems (A, B) respectively having different focal distances, each imaging system (A, B) having an imaging unit (220a, 220b) configured to capture an image of the living tissue; a transmission unit configured to transmit imaging information containing the image captured by the imaging unit (220a, 220b); a storage unit configured to store a threshold with respect to information on a distance between the capsule endoscope device and the living tissue; a detection unit configured to detect the information on the distance between the capsule endoscope device and the living tissue on the basis of the captured image; a battery; a ballast provided on the opposite side with respect to the battery; a controller configured to compare the information on the distance detected by the detection unit with the threshold, select a focal distance based on a result of the comparing, and select one of the two image systems according to the selected focal distance; characterised in that the ballast is movable and the binocular capsule endoscope device further comprises a ballast driver formed of a shape memory alloy, SMA, and configured to compress and extend in a longitudinal direction of the binocular capsule endoscope device to move the movable ballast thereby rotating the capsule endoscope device and changing to the selected image system. an illumination unit (229a, 229b) configured to illuminate a living tissue; two imaging systems (A, B) respectively having different focal distances, each imaging system (A, B) having an imaging unit (220a, 220b) configured to capture an image of the living tissue; a transmission unit configured to transmit imaging information containing the image captured by the imaging unit (220a, 220b); a storage unit configured to store a threshold with respect to information on a distance between the capsule endoscope device and the living tissue; a detection unit configured to detect the information on the distance between the capsule endoscope device and the living tissue on the basis of the captured image; a battery; a ballast provided on the opposite side with respect to the battery; a controller configured to compare the information on the distance detected by the detection unit with the threshold, select a focal distance based on a result of the comparing, and select one of the two image systems according to the selected focal distance; characterised in that the ballast is movable and the binocular capsule endoscope device further comprises a ballast driver formed of a shape memory alloy, SMA, and configured to compress and extend in a longitudinal direction of the binocular capsule endoscope device to move the movable ballast thereby rotating the capsule endoscope device and changing to the selected image system.