This paper describes the bistability of surface levels in vibrating particle beds. When a tube is vertically immersed in a particle bed, and the vessel containing the particles is subjected to vertical vibrations, the surface of the particle bed in the tube stabilizes at a level different from that outside the tube. The present study uses a two dimensional vessel. The vessel is partitioned into three sections, a central and two side sections, by the use of two vertical plates whose lower ends are set at 25 mm from the vessel base. Five sizes of glass beads (mean diameters in the range 116-1090 mu m) were used. It is found that the bed surface sometimes stabilizes at two different levels when a series of experiments is conducted by changing the initial two surface levels, with other experimental conditions fixed. The causes of this bistability are discussed.