The middle ear prosthetic device comprises: a columellate prosthesis arranged to replace the ossicular chain of the middle ear with the exception of the stapes footplate or the entire stapes, a first end of this prosthesis being intended to be inserted into a hole provided in the footplate or to rest on the footplate itself, or to be connected to the stapes capitellum respectively; an annular element of bioinert metal insertable into the auditory tube at the position in which the neotympanum is to be formed; a tensostructure of non-reabsorbable bioinert material, which extends into the interior of the annular element and is fixed to this latter, the tensostructure presenting apertures which provide the surgeon with a sufficient view of the surgical field and allow the required surgical manoeuvres; first and second means for connecting the second end of the columellate prosthesis and the neotympanum to the tensostructure respectively.