Provided is a method for device-to-device (D2D) signal transmission performed by a terminal in a wireless communication system, and a terminal device using the method. The method is characterized by: receiving measurement carrier (MEA_CARRIER) indication information which indicates a single downlink carrier to be used in downlink measurement and synchronization for D2D operation; and using, for the downlink measurement and synchronization for D2D operation, the single downlink carrier indicated by the measurement carrier (MEA_CARRIER) indication information.