The invention provides a sauna indoor climate adjusting device, which enables to compensate for the discomfort in the steam room of the sauna. The invention enables to direct a portion of steam vapour into the lower air layers of the steam room and to mix with air taken from the lower air layers of the steam accordingly. The invention also mixes the air layers in the steam room, which creates a more extensive feeling of comfort in the steam room by decreasing the temperature differences between the air layers； the invention also allows to create a steam sauna effect in the steam room by making the cooling of steam vapour more efficient by combining the openness of the cold air valve and adjusting the rotation of the ventilation fan. The sauna indoor climate adjusting device saves the energy needed for heating the sauna.
