A freeze-drying apparatus, comprising: a vacuum chamber capable of being exhausted; and an injector including a tube member provided to the vacuum chamber, and a nozzle mounted to the tube member and including a plurality of injection holes open to an inside of the tube member, the injector injecting a raw material fluid, which is introduced into the tube member, from the nozzle to the vacuum chamber, the nozzle being a plate-shaped member, the injection holes being through holes formed at a plurality of positions in a surface of the plate-shaped member, characterized in that: a plurality of injectors (25A, 25C) is provided to the vacuum chamber; and the plurality of injectors includes: a first injector including a first nozzle provided with a plurality of first injection holes each having a first hole diameter, and a second injector including a second nozzle provided with a plurality of second injection holes each having a second hole diameter different from the first hole diameter. a vacuum chamber capable of being exhausted; and an injector including a tube member provided to the vacuum chamber, and a nozzle mounted to the tube member and including a plurality of injection holes open to an inside of the tube member, the injector injecting a raw material fluid, which is introduced into the tube member, from the nozzle to the vacuum chamber, the nozzle being a plate-shaped member, the injection holes being through holes formed at a plurality of positions in a surface of the plate-shaped member, characterized in that: a plurality of injectors (25A, 25C) is provided to the vacuum chamber; and the plurality of injectors includes: a first injector including a first nozzle provided with a plurality of first injection holes each having a first hole diameter, and a second injector including a second nozzle provided with a plurality of second injection holes each having a second hole diameter different from the first hole diameter. a tube member provided to the vacuum chamber, and a nozzle mounted to the tube member and including a plurality of injection holes open to an inside of the tube member, the injector injecting a raw material fluid, which is introduced into the tube member, from the nozzle to the vacuum chamber, the nozzle being a plate-shaped member, the injection holes being through holes formed at a plurality of positions in a surface of the plate-shaped member, characterized in that: a plurality of injectors (25A, 25C) is provided to the vacuum chamber; and the plurality of injectors includes: a first injector including a first nozzle provided with a plurality of first injection holes each having a first hole diameter, and a second injector including a second nozzle provided with a plurality of second injection holes each having a second hole diameter different from the first hole diameter. a plurality of injectors (25A, 25C) is provided to the vacuum chamber; and the plurality of injectors includes: a first injector including a first nozzle provided with a plurality of first injection holes each having a first hole diameter, and a second injector including a second nozzle provided with a plurality of second injection holes each having a second hole diameter different from the first hole diameter. a first injector including a first nozzle provided with a plurality of first injection holes each having a first hole diameter, and a second injector including a second nozzle provided with a plurality of second injection holes each having a second hole diameter different from the first hole diameter.