Abstract
The purpose of this study is to clarify the effect of organizational characteristics, organization-based self-esteem (OBSE) and knowledge sharing (KS) motivation on KS behavior based on self-determination theory. Data were gathered by using questionnaires from 500 employees working in various business organizations and a causal model was analyzed using the data. The results show that; 1) "trustworthy relationships and free atmosphere in an organization," enhance KS behavior directly and indirectly through OBSE and identified regulation; 2) competition in organizations inhibits KS behavior through external regulation.