The utility model discloses a front end base, a front end
assembly, an
insertion portion and an
endoscope, and relates to the field of
medical instruments, the front end base is used for the
endoscope, an installation cavity is arranged in the front end base, the installation cavity is communicated with the far end face of the front end base, the installation cavity is used for installing a
camera module and an illumination module, and the side face of the installation cavity is open. At least one of the
camera module and the lighting module is exposed. The
camera module and the lighting module are located in the mounting cavity, it is avoided that a plurality of components are arranged in a plurality of cavities respectively, partition plates among the cavities can reduce the volume
utilization rate of the front end base, the internal space of the front end base can be optimized due to the fact that the camera module and the lighting module are located in the same mounting cavity, and therefore when the lighting module and the camera module of the same specification are arranged, the volume
utilization rate of the front end base is increased. The size of the front-end
assembly can be smaller, and the
trafficability of the front-end
assembly is higher. The front end seat can be provided with a lighting module and a camera module which are larger in size. In addition, installation personnel can install the camera module and the lighting module at the same time, and assembling steps are reduced.