Nation-states are considered to have sovereignty over their territories. However, the sovereignty of weak states is questioned by several actors within them, especially in respect of the idea of the state. Since the classical formulation of "national security" seems to be inadequate for coping with insecurities in weak states, it is important to consider their security predicament with reference to human and societal security conceptions. Although much has been written on the security needs of individuals and communal groups, the interaction of the weak state concept with these two concepts has largely not been discussed among scholars of security studies. In this paper, it will be argued that there should be a mutually reinforcing relationship between human security and societal security because state weakness is the structural cause of not only human insecurity but also societal insecurity as experienced in the daily lives of individuals and communal groups in Third World countries.