NOVELTY - The device comprises a metal piece delimited by a plane (p1). The metal piece comprises two chambers (81, 82) superimposed on each other with respect to the plane and holes (810, 820) that are distributed on a surface of the chambers, are perpendicular to the plane and are divided into two groups. A first group of the holes opens on the plane and directly in the chambers adjacent to the plane. A second group of the holes opens on the plane and in the chamber through channels (83). The plane of the interconnector is intended to come into mechanical contact with a plane of a cathode.    USE - The device is useful for forming an electrical and fluidic interconnector of a high temperature water electrolysis device, which is useful in an assembly for production of hydrogen (all claimed).    ADVANTAGE - The device allows efficient and economic formation of the interconnector with improved electrolysis performance thus easily producing the hydrogen with high quality.    DETAILED DESCRIPTION - The device comprises a metal piece delimited by a plane (p1). The metal piece comprises two chambers (81, 82) superimposed on each other with respect to the plane and holes (810, 820) that are distributed on a surface of the chambers, are perpendicular to the plane and are divided into two groups. A first group of the holes opens on the plane and directly in the chambers adjacent to the plane. A second group of the holes opens on the plane and in the chamber through channels (83). The plane of the interconnector is intended to come into mechanical contact with a plane of a cathode of an electrolysis cell (C1, C2) elementary formed of the cathode, an anode (4) and an electrolyte interposed between the cathode and the anode. The metal piece comprises two pressed sheets, where first of the two sheets is pierced in its flat portion so as to form first group of holes and in its pressed portion so as to form second group of holes. Each of the two pressed sheets are pierced and provided by forming a truncated cone. The first pressed sheet has a shape that is complementary with the second sheet. The first and second sheets are assembled between together by mutual engagement pressing defining the channels. Space is defined by non-pressed portions of the first and second sheets defining adjacent chamber to the plane. The metal piece comprises a third pressed sheet that is welded to the second sheet. The third sheet is not pierced and abuts against the second sheet to rigidify the interconnector and to allow passage of electric current. A space defined by the non-pressed portion of the second and third sheets defining the chamber superimposed adjacent to the chamber to the plane. The first sheet is formed from a flat sheet according to a punching step followed by a drawing step. The second sheet is formed from a flat sheet according to a pressing step followed by a spinning step. The chamber that is adjacent to the plane consists of chamber through which the water vapor is supplied, and a chamber for collection of the hydrogen produced by electrolysis. INDEPENDENT CLAIMS are included for:    (1) an interconnector module; and    (2) a water electrolysis device.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a water electrolysis device.    Anode (4)    Chambers (81, 82)    Channels (83)    Holes (810, 820)    Electrolysis cells. (C1, C2)