Recently, the lattice image of well ordered carbons can be observed pretty easily by high-resolution transmission electron microscopy (HRTEM). In this study, the cross section of the new type carbon nanofiber, of which the special structure was unknown, was observed by HRTEM and the detailed structure was analyzed by image processing. Defects were observed in the ordered structure of this material, that is, the (00.1) lattice planes show large fluctuation in alignment of them and the (10.0) lattice planes make several angles with the (00.1) lattice planes. The average repeat distance d(002) was estimated by HRTEM image and image analysis.