An outdoor power generating apparatus includes a housing placed at an outside and including a power generation chamber, a power generation source accommodated in the power generation chamber and formed by either one of an engine and a fuel cell, an intake portion provided within the housing and positioned at an upper side of the power generation source, the intake portion including an outside air inlet portion that opens to a side wall of the housing to bring an outside air, the intake portion including a meander passage that connects the outside air inlet portion to the power generation chamber while bringing the outside air to meander from the outside air inlet portion towards the power generation chamber, and a drain port provided at the meander passage and discharging a water in a liquid state that remains at the meander passage to an outside of the meander passage.