The main purpose of this study is to examine the mediating effects of the management trust in the relation between job insecurity which are recognized by hotel employees and organizational commitment that is organizational effectiveness by individual employee. Also this study attempts to classify job insecurity into 'weakening of job ability' and 'loss possibility of job itself'. The results were as follows; Frist, job insecurity has significant influence on the management trust. Second, management trust has also significant influence on organizational commitment. Third, In mediating effects of management trust, there is less meaningful effect than direct effect between 'weakening of job ability' and organizational commitment, but management trust works as important mediating role in relation between 'loss possibility of job itself' and organizational commitment. It is shown that management trust is a part of crucial factors in the explanation of the relationships between hotel employee's perceived job Insecurity and organizational commitment. That is, even if hotel employees feel the same amount of job insecurity, its negative impact on their organizational commitment can be significantly decreased when hotel employees have high level of management trust. Based on results of this research, we discussed about meaning and limited of the research, and future study.