To provide the shelf structure of a showcase capable of being changed in the height of movement-restricting plates without requiring plates different in height and size.

The height between the upper surface of a shelf board 31 and the upper end of a movement-restricting plate 33 is set to a first height H1 by pressing the lower edge of the movement-restricting plate 33 with its prescribed surface directed to the rear into the mounting groove 31b of the shelf board 31, while the height between the upper surface of the shelf board 31 and the upper end of the movement-restricting plate 33 is set to a second height H2 by pressing the lower edge of the movement-restricting plate 33 with its prescribed surface directed to the front into the mounting groove 31b of the shelf board 31, so that it is possible to shift the mounting height of the movement-restricting plate 33 only by mounting the same with its prescribed surface directed to the front or rear surface without requiring movement-restricting plates different in height and size and consequently reduce the number of parts.