Although career adaptability and constructivist beliefs both capture important aspects of career construction, previous research has predominantly focused on career adaptability and ignored the importance of constructivist beliefs. Drawing on career construction theory and decision-making science, the current study proposes two factors (i.e., satisficing decision and agentic creation) of constructivist beliefs in career decision-making (CBCD) and develops and initially validates a scale measuring the two factors. Study 1 develops the CBCD Scale and supports the two-factor structure of the CBCD through exploratory factor analysis. Study 2 supports the internal consistency reliability of the CBCD and cross-validates the two-factor structure of the CBCD through confirmatory factor analysis. Additionally, Study 2 finds support for the incremental predictions of the CBCD for career indecision and career decision ambiguity management over and beyond career adaptability. The theoretical and practical implications of the CBCD are discussed, as are the limitations and suggestions for future research.