An anemometer for a wind turbine including a plurality of rotating blades and a hub which is equipped at a rotation center of the plurality of rotating blades and has a nosecone, wherein the anemometer is configured to be equipped in the nosecone, characterized in that the anemometer comprises: a first ultrasonic sensor configured to oscillate a first ultrasonic wave and to receive a second ultrasonic wave; a second ultrasonic sensor configured to oscillate the second ultrasonic wave and to receive the first ultrasonic wave; a third ultrasonic sensor configured to oscillate a third ultrasonic wave in a first direction intersecting the first ultrasonic wave and to receive a fourth ultrasonic wave in a second direction opposing to the first direction; and a fourth ultrasonic sensor configured to oscillate the fourth ultrasonic wave in the second direction and to receive the third ultrasonic wave in the first direction, wherein the first and second ultrasonic sensors (114, 115) are configured to measure a first wind velocity in the same direction as the transmitting direction of the first ultrasonic wave and the third and fourth ultrasonic sensors (116, 117) are configured to measure a second wind velocity in the same direction as the transmitting direction of the third ultrasonic wave. wherein the anemometer is configured to be equipped in the nosecone, characterized in that the anemometer comprises: a first ultrasonic sensor configured to oscillate a first ultrasonic wave and to receive a second ultrasonic wave; a second ultrasonic sensor configured to oscillate the second ultrasonic wave and to receive the first ultrasonic wave; a third ultrasonic sensor configured to oscillate a third ultrasonic wave in a first direction intersecting the first ultrasonic wave and to receive a fourth ultrasonic wave in a second direction opposing to the first direction; and a fourth ultrasonic sensor configured to oscillate the fourth ultrasonic wave in the second direction and to receive the third ultrasonic wave in the first direction, wherein the first and second ultrasonic sensors (114, 115) are configured to measure a first wind velocity in the same direction as the transmitting direction of the first ultrasonic wave and the third and fourth ultrasonic sensors (116, 117) are configured to measure a second wind velocity in the same direction as the transmitting direction of the third ultrasonic wave. a first ultrasonic sensor configured to oscillate a first ultrasonic wave and to receive a second ultrasonic wave; a second ultrasonic sensor configured to oscillate the second ultrasonic wave and to receive the first ultrasonic wave; a third ultrasonic sensor configured to oscillate a third ultrasonic wave in a first direction intersecting the first ultrasonic wave and to receive a fourth ultrasonic wave in a second direction opposing to the first direction; and a fourth ultrasonic sensor configured to oscillate the fourth ultrasonic wave in the second direction and to receive the third ultrasonic wave in the first direction, wherein the first and second ultrasonic sensors (114, 115) are configured to measure a first wind velocity in the same direction as the transmitting direction of the first ultrasonic wave and the third and fourth ultrasonic sensors (116, 117) are configured to measure a second wind velocity in the same direction as the transmitting direction of the third ultrasonic wave.