This study was designed to examine the construct of academic optimism and its relationship with collective responsibility in a sample of Taiwan elementary schools. The construct of academic optimism was tested using confirmatory factor analysis, and the whole structural model was tested with a structural equation modeling analysis. The data were collected from a sample of 1,093 teachers from the 103 schools in Hualien County, Taiwan. The results of this research demonstrated that academic optimism was confirmed as a latent construct manifested by collective efficacy, faculty trust in students and parents, and academic emphasis in Taiwan elementary schools. Furthermore, the research also extended the theory of academic optimism by demonstrating that academic optimism works through collective responsibility to significantly influence student achievement, while controlling for socioeconomic status, school size, and prior student achievement.