A hybrid ventilation apparatus for naturally and forcedly ventilating indoor air of a building, comprising: a housing comprising: a base plate on which a natural ventilation unit for naturally ventilating indoor air of the building and a forced ventilation unit for forcedly ventilating the indoor air are installed; and a cover mounted to the base plate, the cover receiving and protecting the natural ventilation unit and the forced ventilation unit therein, with an inlet port provided on the cover, the inlet port being open downwards; a natural ventilation unit installed in the housing, the a natural ventilation unit having therein flow passage communicating with the inlet port, wherein a worm gear is rotated in a normal direction by drive force of a drive unit under control of the control unit and, simultaneously, pressing members that protrude from the worm gear engage with rotation guide protrusions and rotates dampers and and open the flow passage, and after the flow passage has been opened, the worm gear is reversely rotated by drive force of the drive unit to return the pressing members to original positions thereof, and rollers and are rotated upwards or downwards by a user so that the dampers and are rotated, whereby a degree of opening of the flow passage is adjusted such that the indoor air is naturally ventilated through the flow passage (121'a); and a forced ventilation unit comprising a forced ventilation member provided above the natural ventilation unit and closely mounted to a sidewall of the housing that is in an indoor side of the building, the forced ventilation unit having a heat exchange element therein, the forced ventilation unit comprising a supply fan and an exhaust fan rotating to forcedly ventilate the indoor air under control of the control unit. a housing comprising: a base plate on which a natural ventilation unit for naturally ventilating indoor air of the building and a forced ventilation unit for forcedly ventilating the indoor air are installed; and a cover mounted to the base plate, the cover receiving and protecting the natural ventilation unit and the forced ventilation unit therein, with an inlet port provided on the cover, the inlet port being open downwards; a natural ventilation unit installed in the housing, the a natural ventilation unit having therein flow passage communicating with the inlet port, wherein a worm gear is rotated in a normal direction by drive force of a drive unit under control of the control unit and, simultaneously, pressing members that protrude from the worm gear engage with rotation guide protrusions and rotates dampers and and open the flow passage, and after the flow passage has been opened, the worm gear is reversely rotated by drive force of the drive unit to return the pressing members to original positions thereof, and rollers and are rotated upwards or downwards by a user so that the dampers and are rotated, whereby a degree of opening of the flow passage is adjusted such that the indoor air is naturally ventilated through the flow passage (121'a); and a forced ventilation unit comprising a forced ventilation member provided above the natural ventilation unit and closely mounted to a sidewall of the housing that is in an indoor side of the building, the forced ventilation unit having a heat exchange element therein, the forced ventilation unit comprising a supply fan and an exhaust fan rotating to forcedly ventilate the indoor air under control of the control unit.