NOVELTY - A temperature-humidity exchanger comprises a permeable membrane permeable to moisture; a dry gas separator in which a low-temperature dry gas is caused to flow; and a moist gas separator in which a high-temperature moist gas is caused to flow.    USE - Used as fuel-cell temperature-humidity exchanger.    ADVANTAGE - An inexpensive temperature-humidity exchanger having reliably gas-sealed gas manifolds and delivering a gas at high pressure and high dew-point temperature, is provided.    DETAILED DESCRIPTION - A temperature-humidity exchanger comprises a permeable membrane permeable to moisture; a dry gas separator in which a low-temperature dry gas is caused to flow; and a moist gas separator in which a high-temperature moist gas is caused to flow, the temperature-humidity exchanger being constructed by repeatedly laminating the permeable membrane, dry gas separator, permeable membrane, and moist gas separator, where dry gas separator and moist gas separator each comprise a frame component, flow channels separated from one another by partitions arranged in parallel in a central portion surrounded by the frame component, the flow channels being open in the laminating direction, a first supply manifold to which the gas caused to flow is supplied and a first exhaust manifold from which the gas caused to flow is discharged, the first supply and exhaust manifolds penetrating, in the laminating direction, those portions of the frame component, which are respectively adjacent to both end portions of the flow channels, two aggregate communication grooves penetrating the frame component in the laminating direction, and being constructed by removing the frame component, to respectively establish communication between both ends of flow channels and the first supply and exhaust manifolds, first upper and lower seal formation plates, which are in contact with the first supply manifold and bridged in a two-stage way across one of the aggregate communication grooves in the laminating direction, with a face contacting the permeable membrane being coplanar with a contacting face between the frame component and the permeable membrane, and which are offset from each other when projected onto each other, second upper and lower seal formation plates, which are in contact with the first exhaust manifold, and bridged in a two-stage way across the other of the aggregate communication grooves in the laminating direction with a face contacting the permeable membrane being coplanar with a contacting face between the frame component and the permeable membrane, and which are offset from each other when projected onto each other, and second exhaust and supply manifolds disposed adjacent to the first supply and exhaust manifolds respectively, and extending through the laminating direction, and the first supply manifold, first exhaust manifold, second supply manifold, and second exhaust manifold of the dry gas separator are superposed on the second supply manifold, second exhaust manifold, first supply manifold, and first exhaust manifold of the moist gas separator, respectively, via through-holes formed in the permeable membrane.    DESCRIPTION OF DRAWING(S) - The figure is a side view of a temperature-humidity exchanger.    Inlet retainer plate (3)    Outlet retainer plate (4)    Dry gas inlet manifold (5)    Moist gas outlet manifold (6)    Dry gas outlet manifold (7)