The purpose of this paper is to investigate the developmental antecedents of entrepreneurial self-efficacy (ESE) and outcome expectations (EOE) through the integration of social cognitive career theory (SCCT) with Obschonka’s (2016) biopsychosocial model of entrepreneurship. Specifically, guided by the integrated models, I examined the antecedent influence of openness personality, social class and entrepreneurial learning experiences (ELE) on ESE and EOE. The design of the study is cross-sectional, the sample size is 376, and the data were analysed with regression path analysis. The findings of this study showed the following. Firstly, the openness personality trait directly led to entrepreneurial learning experiences, ESE and EOE. Openness personality also led to ESE and EOE through positive entrepreneurial emotions (EPE), ESE through entrepreneurial personal mastery (EPM), and EOE through entrepreneurial vicarious learning (EVL). Furthermore, openness personality led to ESE and EOE through the serial mediation of EVL, EPM, and EPE; the serial mediation of EVL and EPE; and the serial mediation of EVL and EPM. Moreover, high social class individuals were directly high in EVL and EPM and indirectly high in ESE and EOE through EVL. In addition, high social class individuals were high in ESE and EOE through the serial mediation of EVL, EPM and EPE; and high in ESE and EOE through the serial mediation of EVL and EPM and through the serial mediation of EVL and EPE. This study extends the theoretical literature on the antecedents of ESE and EOE and practically shows the developmental antecedents of ESE and EOE from another perspective.