A fluorescent display device having pattern display sections each composed of phosphor-coated anodes arranged in the form of a matrix, at least a filament for emitting electrons when heated, the anodes being selectively bombarded with electrons emitted from the cathode to produce a visual display, position-selecting grids provided between the filament and the pattern display sections, column-selecting grids or row-selecting grids provided opposite to the columns or rows of the anodes, and a frame member provided, on its surface facing the filament, with the position-selecting grids and on its surface facing the pattern display section with the column-selecting grids or the row-selecting grids, the frame member being made of insulating material at least where necessary. With the provision of the frame member, the device of the present invention can be assembled easily, securely and correctly, and can produce a high-quality display.