Disclosed in the present application is a method, by a terminal, for relaying a discovery signal for terminal-to-terminal direct communication in a wireless communication system. Particularly, the method comprises the steps of: detecting a plurality of discovery signals transmitted from the same source terminal; determining whether to relay one of the plurality of discovery signals on the basis of a first hop count included in the plurality of discovery signals; and when it is determined to relay the one discovery signal, relaying the one discovery signal to another terminal, wherein a second hop count included in the one discovery signal to be relayed increase or decreases on the basis of the first hop count.