Employees are the key to every business success. Therefore, it is necessary to regularly examine the elements of their job satisfaction in order to understand what makes employees happy and what motivates them to work better and be more efficient. Also, it is necessary to conduct continuous research and compare the results with the previous researches in order to monitor the shift in employee satisfaction with their work and to monitor the effectiveness of the measures implemented to increase overall satisfaction. For a manufacturing company as well, the degree of employee’ satisfaction with the job and the effectiveness of measures to increase it are key to maintain workers in the workplace. With each year of service in the same workplace, the production worker becomes more efficient and makes a greater contribution to the company. He is familiar with the specifics of the manufacturing process and has acquired the knowledge and skills required to operate machinery and tools. In the theoretical part of the paper, the basic characteristics of job satisfaction are summarized, also the concept and role of job satisfaction, followed by theories, factors and measurements of job satisfaction. Some characteristics of medium-sized manufacturing companies are also explained. The empirical part analyzes conducted research of elements of job satisfaction of employees in medium-sized manufacturing companies and presents the results of total job satisfaction, individual results for each element, and a comparison of the elements of satisfaction between employees in the manufacturing facility and other employees in the manufacturing company. The results of the survey showed that employees in medium-sized manufacturing companies are dissatisfied with their jobs. They are mostly dissatisfied with their salary, rewards and benefits. Non-manufacturing workers are slightly more satisfied with the above elements compared to the factory workers themselves but are still in the low satisfaction category.