An in-vivo image acquiring apparatus (10) includes an operation control unit (161) which controls a black image acquiring operation, in which the operation control unit controls an imaging unit (110) and an illuminating unit (120) in such a manner the imaging unit (110) conducts an image acquiring operation in a state the illuminating unit (120) does not conduct an illuminating operation. The in-vivo image acquiring apparatus (10) also includes an average calculating unit (137) which calculates the average value of pixel value in a predetermined determining area, and a black image determining unit (139), which determines whether the image information acquired by the image acquiring operation is the black image by comparing the average value with a predetermined threshold value. The image information determined as the black image by the black image determining unit (139) is transmitted, as the black image information, to an external apparatus (30) by radio.
