On January 26, 2012, the so-called “the Part-Time Instructors Act” was promulgated in order to secure the employment stability and status of part-time instructors who are facing with poor positions. However, the enforcement of this Act was delayed twice and it is scheduled to take into force on January 1, 2016. That is largely because the enforcement of the Act is likely to cause results that are contrary to the original intent of the legislation so the part-time instructors that are possible beneficiaries of the Act are desperately opposing the Act. At this point, it is necessary to discuss the application of social insurance among the issues related to the improvement of treatment of part-time instructors. In this regard, this study presents ways to extend the application of four major insurance (the National Pension, the National Health Insurance, the employment insurance and the industrial accident compensation insurance) to part-time instructors. First, with respect to the National Pension, the employment insurance and the industrial accident compensation insurance, it is important to conclude a contract for the minimum six months with part-time instructors in order to help them maintain their qualification for employment provided policyholder for receiving the benefits of each social insurance during vacation period when they have no class. Insurance premiums of the National Pension and the employment insurance during the vacation period can be deducted on the month when the last wage is paid (for example, June or December). Second, the National Health Insurance is the most needed for part-time instructors among the four major social insurance. Compared with other social insurance, the health insurance is burdensome, so the change to employment provided policyholder for part-time instructors should be first considered. Third, when calculating the employment insurance premiums of part-time instructors, it is necessary to include preparation time of two hours for one-hour class, rather than to only count the days they actually have classes, taking into consideration the time for preparing classes, assessing students and dealing with school administrative affairs. In cases of having classes at more than two schools, it is necessary to guarantee benefits of the employment insurance and to secure unemployment allowance by deducting employment insurance premiums from each school like the National Pension. In addition, the Government and colleges should endeavor to improve legislative systems to provide stability to part-time instructors when they have classes and perform research. This will bring about positive functions, such as improvement of higher education and strengthening of competitiveness of colleges. In this regard, it is essential to remember that the extended application of social insurance to part-time instructors will guarantee their stable life.