Purpose This study aimed to investigate the factors influencing job embeddedness among advanced beginner nurses, with particular emphasis on the roles of positive psychological capital and the nursing work environment. Methods: This cross-sectional study included 216 advanced beginner nurses from two university-affiliated hospitals. Data were obtained using standardized questionnaires and analyzed with descriptive statistics, the independent t-test, one-way analysis of variance, Pearson correlation coefficients, and multiple regression analysis. Results: The average score for job embeddedness was 3.34±0.54, for positive psychological capital was 4.00±0.67, and for the nursing work environment was 2.67±0.39. Multiple regression analysis showed that positive psychological capital and the nursing work environment significantly predicted job embeddedness, accounting for 59.3% of its variance. Conclusion: The findings suggest that enhancing positive psychological capital and improving the nursing work environment are essential for promoting job embeddedness among advanced beginner nurses. These results provide empirical support for the development of targeted interventions that facilitate their transition toward becoming competent nurses.