The present specification relates to a method by which a first user equipment (UE) performs a transmission power control (TPC) of device-to-device (D2D) communication in a wireless communication system supporting the D2D communication, comprising the steps of: acquiring a resource pool to be used in the D2D communication, the resource pool including a scheduling assignment (SA) resource pool indicating an SA transmission resource region and/or a data resource pool indicating a D2D data transmission resource region; transmitting an SA including information related to D2D data transmission to a second UE through the SA resource pool; and transmitting D2D data to the second UE, wherein the TPC in the D2D communication is performed through control information related to a TPC of the SA and/or the D2D data.