The drying characteristics of porous materials immersed in a fluidized bed were examined. The glass bead (0.12 mm in diameter) was used as the fluidizing particle. A brick ball and a sintered glass ball were used as the samples, mainly. The sample was fixed or unfixed in the fluidized bed. The mass velocity and temperature of drying gas were changed. In the case of unfixing, the brick ball floats on the bed and the sintered glass ball sinks at the bottom of the bed. The drying time for unfixing is shorter than that for fixing in the fluidized bed when the sample exists on the bed surface. The fluidization behavior of bed has a large effect on the drying characteristics of the unfixed sample. There is the period when the temperature of sample center is constant, and the temperature becomes higher with an increase in the drying gas temperature.