Clark and Wells’ (1995) model of social phobia proposes that there are three types of maladaptive self-beliefs responsible for persistent social anxiety (high standard, conditional, and unconditional beliefs). Although these beliefs are theoretically important, there currently is not a validated measure of these beliefs in the social anxiety literature. Hence, the Self-Beliefs Related to Social Anxiety (SBSA) Scale was developed (Wong and Moulds 2009) and its psychometric properties were examined in the current study using a non-clinical sample (N = 600). Exploratory and confirmatory factor analyses ultimately indicated that a correlated three-factor solution optimally summarized the data with the three factors corresponding to the three belief types. The SBSA and its three subscales demonstrated good internal consistency and test-retest reliability, as well as convergent and divergent validity. The SBSA thus appears to have good psychometric properties and is appropriate for use in non-clinical samples. The potential applications of the SBSA and avenues for future research are discussed.