A heat-exchange type ventilation apparatus, comprising: a main body in which a supply air path and a discharge air path are formed, the supply air path comprising an exterior inlet portion to admit outside air and an interior outlet portion to discharge the outside air, the discharge air path comprising an interior inlet portion to admit inside air and an exterior outlet portion to discharge the inside air; an air supplying fan placed in the supply air path; an air discharging fan placed in the discharge air path; and a heat exchanger to allow heat exchange between air passing through the supply air path and air passing through the discharge air path, wherein the heat exchanger comprises: a heat exchange element comprising a plurality of partition members each having a sheet-like and polygonal shape, the partition members being stacked with spacing between the partition members; and a frame member covering an edge of the heat exchange element, the edge extending in a stacking direction of the partition members, with the frame member having an L-like shape in a section and facing two of the side surfaces of the heat exchange element that extend from the edges of the heat exchange element; an outer protrusion that extends in the stacking direction and is formed on a surface of the frame member, the surface being opposite a surface of the frame member facing the heat exchange element, and an inner protrusion (53, 54) that extends in the stacking direction and is formed on each of the two frame member faces facing the surfaces of heat exchange element and in line contact with the heat exchange element, wherein the inner protrusions (53, 54) abut on the side surfaces of the heat exchange element or dig into the side surfaces of the heat exchange element 21. a main body in which a supply air path and a discharge air path are formed, the supply air path comprising an exterior inlet portion to admit outside air and an interior outlet portion to discharge the outside air, the discharge air path comprising an interior inlet portion to admit inside air and an exterior outlet portion to discharge the inside air; an air supplying fan placed in the supply air path; an air discharging fan placed in the discharge air path; and a heat exchanger to allow heat exchange between air passing through the supply air path and air passing through the discharge air path, wherein the heat exchanger comprises: a heat exchange element comprising a plurality of partition members each having a sheet-like and polygonal shape, the partition members being stacked with spacing between the partition members; and a frame member covering an edge of the heat exchange element, the edge extending in a stacking direction of the partition members, with a heat exchange element comprising a plurality of partition members each having a sheet-like and polygonal shape, the partition members being stacked with spacing between the partition members; and a frame member covering an edge of the heat exchange element, the edge extending in a stacking direction of the partition members, with the frame member having an L-like shape in a section and facing two of the side surfaces of the heat exchange element that extend from the edges of the heat exchange element; an outer protrusion that extends in the stacking direction and is formed on a surface of the frame member, the surface being opposite a surface of the frame member facing the heat exchange element, and an inner protrusion (53, 54) that extends in the stacking direction and is formed on each of the two frame member faces facing the surfaces of heat exchange element and in line contact with the heat exchange element, wherein the inner protrusions (53, 54) abut on the side surfaces of the heat exchange element or dig into the side surfaces of the heat exchange element 21.