To provide a shelf structure having sufficient strength without requiring complicated construction processes to make a wall surface excellent in the design.

A bracket 1 includes an L-shaped or T-shaped flat plate part formed of a horizontal part 3 and a vertical part 2, and a shelf board fixing piece 4 horizontally extending from the upper end of the horizontal part 3. The vertical part 2 is attached to a side face of a vertical beam 11 inside the wall surface with only the horizontal part 3 exposed to the interior, and a shelf board 14 is mounted and fixed on the shelf board fixing piece 4.