The present study investigated the cultural equivalence of Self-Monitoring Scales (Snyder, 1974) through an examination of differential item functioning (DIF) using structural equation modeling. The data were collected in Japan (n=211) and the US (n=171). Factorial analyses were conducted on three factors of Self-Monitoring Scales: Extraversion, Other-Directedness, and Acting. DIF analyses were then conducted between the Japan and US data on five items in Extraversion, four items in Other-Directedness, and four items in Acting. The results showed that partial factorial invariance was confirmed in both the Extraversion and Acting factors, and strong factorial invariance was detected in the Other-Directedness factor; therefore, each factor of the Self-Monitoring Scales showed reasonable evidence for their cultural equivalence. Based on the results of the DIF analyses and factor mean comparisons between the Japan and US data, the cross-cultural validity of these scales was discussed.