This thesis focuses on the relations between job insecurity and its consequences by addressing several specific research aims. The first research aim focused on expanding the range of job insecurity consequences by studying the relation between job insecurity and work–family conflict over time. In Study 3 it was found that job insecurity affected work–family conflict one year later among men. The second research aim addressed mechanisms involved in the job insecurity–outcome relations, focusing on factors that might make employees more vulnerable to, or buffer against the negative effects of job insecurity. Coping styles were investigated as potential moderating factors in Study 1, where it was found that problem-focused coping did not function as a buffer, nor did devaluation or avoidance coping. Avoidance coping was actually a vulnerability factor for men, and related to more negative reactions to job insecurity in terms of well-being. Two forms of job dependence as potential moderating factors of the relations between job insecurity and its outcomes were investigated in Study 2. It was found that the relative contribution to the household income functioned as a vulnerability factor for men. Higher levels of work centrality combined with either quantitative or qualitative job insecurity were related to higher levels of job satisfaction among women. Finally, in Study 3, workload was investigated as a mediating variable of the relation between job insecurity and its outcomes, where workload linked job insecurity to work–family conflict one year later among men. The third research aim of this thesis addressed gender, where differences between men and women were found in all three studies. Overall men seemed to suffer more from job insecurity. The results of the thesis confirm the negative impact of job insecurity, but also provide information regarding important areas for future research to study, such as the investigation of mechanisms and the role of gender. / At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Submitted. Paper 2: Submitted.