The discovery of superconductivity in diamond opened up a new field of superconductivity in doped semiconductor. Using the chemical vapor deposition (CVD) method, polycrystalline and homoepitaxial superconducting diamond films have been successfully synthesized. These films show relatively high superconducting transition temperatures, particularly in homoepitaxial (111) film that showed the highest superconducting transition temperature of Tc = 11.4 K. Since high quality and large films can be obtained by the CVD method, many fundamental physical measurements were carried out to understand the mechanism of superconductivity in diamond. In this report, the recent data about superconducting properties of heavily boron-doped diamond are discussed.