Abstract: A humidifying device (nebulizer) includes a liquid receptor configured to temporarily store a liquid, a liquid transfer mechanism configured to transfer a liquid from a container to the liquid receptor, a receptor-side aerosol forming member configured to suck the liquid of the liquid receptor from a liquid suction port by a negative pressure produced by a gas jetted from a gas jetting part of a nozzle member, and form an aerosol of the liquid with a receptor-side aerosol generation nozzle, and a heating mechanism configured to heat at least part of the liquid of the liquid receptor or the liquid in the receptor-side aerosol forming member. A humidifying device that can perform efficient and hygienic heating by using a heater during humidification can thus be provided.