[Object] To provide a freeze-drying apparatus and a freeze-drying method, which are capable of increasing a drying efficiency of frozen particles.[Solving Means] The freeze-drying apparatus 100 includes a freezing chamber 10 into which a raw material fluid F is injected. During the injection of the raw material fluid F, after the injection of the raw material fluid F, or for a time period covering the start to the termination of the injection of the raw material fluid F, a shelf 16 is vibrated in a horizontal direction due to an actuation of vibration generators 31. With this, the frozen particles deposited on the shelf 16 are evenly diffused on the shelf 16 in such a manner that a deposition thickness thereof becomes smaller or a single layer thereof is formed. With this, a freezing efficiency and the drying efficiency of individual particles are promoted.
