Device forming a sealing frame providing electric insulation for gas distribution in a SOEC type high-temperature steam electrolyser or in a SOFC type fuel cell, the device comprising: - a part in electric insulating material lying along two axes of symmetry (X, Y) at right angles to each other and pierced by a central opening, the peripheral edge of which constitutes a support for a SOEC or SOFC electrochemical cell (C1, C2, etc.) formed by a cathode, an anode and an electrolyte inserted between the cathode and the anode, the part also being pierced by four peripheral openings (81, 82, 83, 84) opposite each other in pairs on the periphery of its central opening, two of the peripheral openings (83, 84) lying along a length more or less corresponding to the length of the central opening according to one of the axes X and distributed on either side of this axis X, whereas the other two peripheral openings (81, 82) are lying along a length more or less corresponding to the length of the central opening according to the other of the axes Y and distributed on either side of this axis Y, on one of its principal faces the part also comprising ribs defining gas distribution channels connecting each of the two peripheral openings (83, 84) lying along the axis X on the central opening and on its opposite principal face ribs defining gas distribution channels connecting each of the two peripheral openings (81, 82) lying along the axis Y on the central opening, on each of its principal faces the part also comprising at least three continuous, hollow areas, one of which is on the periphery of the central opening, the ribs and the two openings connected to the central opening at the same time and each of the two others of which is on the periphery of one of the peripheral openings not connected to the central opening; - seals in the form of continuous strands, one of which is deposited on the support of the cell and the others of which (71, 72, 73, 74) are deposited individually in or along each of the continuous, hollow areas. - a part in electric insulating material lying along two axes of symmetry (X, Y) at right angles to each other and pierced by a central opening, the peripheral edge of which constitutes a support for a SOEC or SOFC electrochemical cell (C1, C2, etc.) formed by a cathode, an anode and an electrolyte inserted between the cathode and the anode, the part also being pierced by four peripheral openings (81, 82, 83, 84) opposite each other in pairs on the periphery of its central opening, two of the peripheral openings (83, 84) lying along a length more or less corresponding to the length of the central opening according to one of the axes X and distributed on either side of this axis X, whereas the other two peripheral openings (81, 82) are lying along a length more or less corresponding to the length of the central opening according to the other of the axes Y and distributed on either side of this axis Y, on one of its principal faces the part also comprising ribs defining gas distribution channels connecting each of the two peripheral openings (83, 84) lying along the axis X on the central opening and on its opposite principal face ribs defining gas distribution channels connecting each of the two peripheral openings (81, 82) lying along the axis Y on the central opening, on each of its principal faces the part also comprising at least three continuous, hollow areas, one of which is on the periphery of the central opening, the ribs and the two openings connected to the central opening at the same time and each of the two others of which is on the periphery of one of the peripheral openings not connected to the central opening; - seals in the form of continuous strands, one of which is deposited on the support of the cell and the others of which (71, 72, 73, 74) are deposited individually in or along each of the continuous, hollow areas.