The present study examined whether listener's familiarity with a talker's voice improved speech recognition in noisy condition. Subjects were asked to perform word and sentence intelligibility task in noisy condition under following three conditions; (1)subjects heard familiar voice and were informed who was speaking (explicit-familiar condition), (2)subjects could hear familiar voice but were not informed who was speaking (implicit-familiar condition), (3)subjects heard unfamiliar voice and were not informed who was speaking (novel condition). We used subject's friend's voice as a familiar voice. As a result, the percentage of correct answer of explicit-familiar condition and implicit-familiar condition were better than that of novel condition, but there was no significant difference between explicit-familiar condition and implicit-familiar condition. Present results revealed that the familiarity with a talker's voice improved speech recognition in noisy condition, while knowing who was speaking did not influence speech recognition.