Abstract: The invention relates to a display unit in which a plurality of long containers 3 is disposed side by side with the length directed vertically, the long containers 3 containing water, and an air feed pipe 6 corresponding to each long container 3 for feeding air from the bottom of the long container 3 includes: a solenoid valve 7 switched under the control of a controller 11 for feeding and stopping the air supplied from an air pump; a flow controller 8 capable of maintaining the flow rate of the air to be fed at a predetermined value; a check valve 9, the elements being arranged in order in the direction of feed; and an air stone 5 at the end, wherein images are displayed by the microbubbles generated from a filter 5c substantially around the outer periphery of the air stone 5, whereby expressing beautiful images with excellent uniformity and clearness by bubbles.