A printing device for printing on containers in a rotationally-driven container conveying unit by means of which containers are conveyed between at least one container feed location and at least one container removal location, the printing device, and including at least one print head and at least one housing for housing a container. Each housing includes a hollow body, which is partially open at least in a printing area and which is used for accommodating the container, the opening for the printing area defining a front side and a side located opposite the front side defining a rear side.