An organ imaging apparatus (1) has an imager (3), a detector, and an illuminator (2). The imager (3) acquires an image by imaging an imaging object including an organ of a living body. The detector detects a feature of the imaging object based on the image acquired by the imager (3). The illuminator (2) illuminates the imaging object at an angle exceeding 45 degrees but not more than 90 degrees relative to the imaging optical axis (X) of the imager (3) passing through the imaging object. The imager (3) images the shadows formed by the imaging object under illumination by the illuminator (2). The detector detects the surface irregularities on the imaging object and the boundary of the organ included in the imaging object based on the shadows.
