The present invention provides an endoscope (1) with an extra fine diameter, whereby the strength and the service life of the outer tube and / or of the inner pipe, which an insertion section (2) of the endoscope (1) form, is improved, wherein at the same time a good power and the ease of operation can be maintained, wherein lenses (l) can be positioned easily and precisely when different types of lenses (l) are arranged. As such an outer pipe (10) and / or inner tube (20, 21, 40), the the entry portion (2) of the endoscope (1) with an extra fine diameter, casting, a special electronic tube is used which is formed by means of a predetermined manufacturing process.
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