It is conventional in research on the legitimacy of the U.S. Supreme Court to rely on a survey question asking about confidence in the leaders of the Court to indicate something about the esteem with which that institution is regarded by the American people. The purpose of this article is to investigate the validity of this measure. Based on a nationally representative survey conducted in 2001, we compare confidence with several different measures of Court legitimacy. Our findings indicate that the confidence replies seem to reflect both short-term and long-term judgments about the Court, with the greater influence coming from satisfaction with how the Court is performing at the moment. We suggest a new set of indicators for measuring the legitimacy of the Court and offer some evidence on the structure of the variance in these items.