The authors describe the case of an incarcerated femoral hernia in an infant. A 4-month-old female infant was hospitalized with an incarcerated right groin hernia. Attempts to reduce the mass were unsuccessful, so an emergency surgery was performed. During surgery, the hernial sac seemed to protrude under the inguinal ligament. The authors opened the hernial sac and observed a dark red small intestine. The authors did not resect the intestine because its color gradually improved after the constriction was released. The hernial sac passed under the inguinal ligament, and the infant was diagnosed with incarcerated femoral hernia.