The invention provides an apparatus for manufacturing a tire ply material, in which even is curling deformation occurs, it is possible to connect the edges of the cut pieces with each other with accuracy and thereby a nondefective uniform tire ply material can be manufactured. The apparatus for manufacturing a lengthy tire ply material as numbers of cut pieces connected in series in a conveyed direction by successively joining the rear edge of a cut piece conveyed ahead and the front edge of a next cut piece. The apparatus comprises: an image capture device for capturing an image of the rear edge portion of the going-ahead cut piece and an image of the front edge portion of the next cut piece; a position identifying unit for identifying each position of the front edge portion and the rear edge portion by processing the image data; and a front edge holding moving unit which moves the front edge of a cut piece on one part to a connection position of the rear edge porton of the cut piece on the other part based on the data acquired by the postion identifying unit.