This paper offers an analysis of the career security according to three criteria defined by the CERC (2005) : the job stability (length of job tenure), the job security (short duration of unemployment after an external mobility) and the income security (maintaining or increasing incomes). We try to verify if job characteristics are more important factors than classical individual variables to explain these three criteria. The 2003 FQP Survey contains rich information to describe jobs. It offers usual information as the sector or the size of the company and also newer information about concrete conditions of job as the use of information technology, the work rate, contact with the public, type of hierarchical control, position in the firm. We process all these data to analyze the link between characteristics of job, and career security. On the one hand, variables connected to the job are the most important to explain employment stability and income security. On the other hand, individual's variables as age and diploma become at least as much determining as the characteristics of the last job to explain job security when a worker left his job. This result throws light on the debate on the flexicurity based on a strong individual involvement of employees in their career curriculum.