We encountered a case of focal nodular hyperplasia (FNH) of the liver in which an abdominal ultrasound (power doppler technique) was helpful for diagnosis. A 36-year-old man complaining of nausea and vomiting was pointed out having a hepatic mass by an abdominal ultrasonography and admitted to the hospital. Abdominal ultrasound and B-mode visualized the mass as iso-echoic signal tumor in the left lateral segment of liver. Power doppler technique showed the blood flow signal that looked like spoke-wheel, and we suspected FNH of the liver. Computed tomography and a magnetic resonance imaging showed non-specific signs, but an angiography of the liver showed a spoke wheel appearance. So FNH was diagnosed. Ultrasonography can make various view planes by changing the direction of ultrasound beam. Power doppler technique is more helpful to detect the spoke wheel appearance than any other examinations. We think that power doppler technique should be attempted if the tumor is suspected of FNH.