A minute hemorrhage in the small intestine is identified with good sensitivity to easily detect the presence or absence of a hemorrhage in patients with unidentified hemorrhages. Provided is an in vivo examination apparatus (1) that includes an illumination unit (2) that emits two types of illumination light in different wavelength bands and an image acquisition unit (3) that has sensitivity to the wavelength bands of the two types of illumination light emitted from the illumination unit (2). Blood and background tissue have higher reflectances than a predetermined threshold with respect to illumination light in a first wavelength band emitted from the illumination unit (2), blood has a lower reflectance than the threshold with respect to illumination light in a second wavelength band, and a condition (R1b/R1a) > (R2b/R2a) is satisfied, where R1a is the reflectance of the background tissue with respect to the illumination light in the first wavelength band, R1b is the reflectance of the blood with respect to the illumination light in the first wavelength band, R2a is the reflectance of the background tissue with respect to the illumination light in the second wavelength band, and R2b is the reflectance of the blood with respect to the illumination light in the second wavelength band.
