A mist generator device includes a mist generation unit (30) that generates mist from a liquid. A mist flow passage (37) is connected to the mist generation unit (30). The mist from the mist generation unit (30) flows through the mist flow passage (37). A tubular mist nozzle (50) releases the mist, which is supplied from the mist generation through the mist flow passage (37), out of the mist generator device. The mist nozzle (50) includes a mist entrance (52), a mist exit (53), and an inner constriction (54, 55) located at an inner side of the mist nozzle (50). The inner constriction (54, 55) includes a step (54a, 55a) that decreases an inner diameter of the mist nozzle (50) from the mist entrance (52) toward the mist exit (53). This limits the flow of the liquid droplets from the steps (54a, 55a) of the constrictions (54, 55) toward the mist exit 53. When a certain amount of condensation collects at the steps (54a, 55a), the condensation falls and returns toward the mist entrance 52.
