Abstract: The present invention discloses a folder index pocket structure, comprising a main body for being used in a folder having a plurality of loose-leaf pages, and such main body is a thin plastic transparent plate using a front cover sheet and a back cover sheet on one side of the main body to define an index pocket for holding an index card; a folded edge is disposed at the bottom of the index pocket to receive the index card; and a through hole is disposed on the back cover sheet for letting a user push the index card into and out of the index card pocket by finger. By means of the marked numbers on the index card corresponding to the page number, we can attain the purposes of turning the page and search the content quickly. Furthermore, the index pocket is used to protect the index card, so that the index card has the functions of resisting water and dirt, preventing damages, and saving materials.