To provide a pocket structure in a door lining and a side lining capable of improving the matching accuracy between a partition plate to be stored in a pocket and an inner wall surface of the pocket, and enhancing the appearance in the pocket.

A door pocket 30 formed on a door lining 10 is constituted by mounting a pocket cover 40 at the predetermined position of the surface of a door lining body 20. A partition plate 50 attached to the inner side of the door pocket 30 employs an insertion structure in which an insertion piece 54 is provided on an edge 50b on one side, and inserted in and fixed to an insertion hole 43 in an inner surface of the pocket cover 40, and also employs a guide structure in which an edge 50c on the other side is fitted to the door lining body 20 in a mating manner. The mating accuracy between inner wall surfaces 31a, 31b of the pocket and the partition plate 50 is improved, and detachment or deformation is prevented even when the width L to the distal side of the door pocket 30.