A stereo endoscope including: a shaft; and an objective lens including: a distal objective lens portion, where beam paths of right and left partial images extend through common optical components; a proximal objective lens portion, where the beam paths of the right and left partial images extend through separate optical components; and a transition portion, where the beam paths of the right and left partial images, which emerge from the distal objective lens portion at an angle to one another, are aligned parallel to one another; the transition portion comprises a lateral spreading arrangement including optical components for increasing a distance between the beam paths of the right and left partial images; and the lateral spreading arrangement is configured to laterally spread the beam paths of the right and left partial images asymmetrically in relation to an optical axis of the distal objective lens portion.