To realize a capsule endoscope capable of acquiring a high quality image, a capsule endoscope (2) has an illuminating unit (11), an imaging unit (12), an image luminance deriving unit (16), a reference luminance information storage (17), a comparing unit (18), a light-emission-amount adjustment unit (19), a timing controlling unit (20), and a timing generator (21). The illuminating unit 11 outputs illuminating light. The imaging unit (12) picks up a subject interior image. The image luminance deriving unit (16) derives luminance of a picked up image. The reference luminance information storage (17) stores reference luminance. The comparing unit (18) compares the image luminance and the reference luminance. The light-emission-amount adjustment unit (19) adjusts emission amount of the illuminating unit (11) based on a comparison result. The timing controller (20) controls driving timings of each element. The timing generator functions as a noise canceller and the like. The timing controller (20) controls timing operated as the noise canceller during a period right after when output of electronic signals from the imaging unit (12) is finished and before when output of the illuminating light emitted from the illuminating unit 11 is started, independent of a change of an emission amount of the illuminating unit (11). Consequently, noise components caused by dark current is eliminated without negatively affecting other operations.
