The investigation research of the electrostatic discharge ESD was carried out from the viewpoint of EMC in order to clarify the mechanism of the EMI with the ESD by the EMC investigation expert committee. The transient electromagnetic noise by the ESD has the wideband frequency spectra which reach the microwave band. Therefore, the grasp of the frequency spectra of the phenomenon and generation of electromagnetic wave are very difficult. As a result of the investigation, following results were obtained. (1) A knowledge on the ESD was consolidated, and common recognition was confirmed as an EMC problem. (2) The measuring methods of transient current up to 12GHz and transient electromagnetic field up to 3GHz were established. (3) Basic data of polarity characteristics of the impulse electromagnetic wave were obtained.