Diamond-like carbon (DLC) is an amorphous form of carbon that contains aspects of both the diamond and graphite structures. It is composed of carbon and hydrogen, and owing to its texture, high mechanical hardness, chemical inertness, and optical transparency, DLC is widely used as a protective coating in the form of a thin film, which is applied to the surfaces of many materials. Recently, it has attracted attention as a biomedical material because of its high biocompatibility and stability [1,2]. DLC is particularly suitable to be embedded in the body owing to its low friction properties and selective cell surface attachment properties . The material is currently being developed for the treatment of bone fractures . However, unlike fibroblasts, the attachment of osteoblasts has not been extensively examined and no morphological data is available on how osteoblastic cells form contacts with the surface of biocompatible DLC-coated materials. Herein, such data were collected by coating DLC on the surface of silicon plates. The attachment of mouse cells to the DLC-coated plates was examined by colorimetric cell proliferation assay, and morphological observations were made using a field emission scanning electron microscope. Also, the flat cross section of the cell and plate was obtained by the ion milling method.