A seatback pocket structure includes a back board forming a back side of a seatback and a pocket forming board attached to the back board to define a seatback pocket between the back board and the pocket forming board. The back board includes a main part defining a major plane of the back board, and a cantilever tab having a base end connected to the main part and adapted for elastic bending deformation. The pocket forming board is connected to a free end part of the cantilever tab.