A resource allocation method and device capable of preventing resource conflict in a wireless communication system supporting device-to-device (D2D) communication is provided. The resource allocation method includes transmitting to a base station, by a relay user equipment (UE) located within a coverage of the base station, a message comprising indication information related to the relay UE, and performing, by the relay UE, D2D communication with a remote UE located out of the coverage by using a first resource, the first resource being allocated by the base station based on the indication information.