The purpose of this study was to investigate the influence of job satisfaction concerning the work performance of Ayudhya Capital Auto Lease Public Company Limited (Krungsri Auto) employees after the merger. The sample consisted of 2468 employees of Ayudhya Capital Auto Lease Public Company Limited (Krungsri Auto Personnel Department 2016). According to Krejcie and Morgan (1970) the samples used in the study were 331 who were asked to provide data through a questionnaire developed by the researcher. Its reliability regarding the Alpha value was .939 and the analysis of the respondents’ data frequency and percentage mean and standard deviation were applied. The analysis of data on the job satisfaction and Krungsri Auto employees’ performance relied on the inferential statistics while the hypothesis was tested by using multiple regression analysis and the results were as follows. The analysis of general education data of the population showed that most respondents were females between 31-40 years old with bachelors’ degrees and were in the entry-level positions for 1-5 years earning 15000 – 30000 Baht. It was found that Krungsri Auto employees’ the work motivation in the overall staff was very high. The highest was the aspect of the work characteristics followed by work success work responsibility work atmosphere salary and welfare and good governance which were all in high levels. However the acceptance aspect was in the moderate level. As for Krungsri Auto employees’ job satisfaction it was found that the satisfaction of employees in terms of the career security work atmosphere good governance salary and welfare were at high level. The job satisfaction on the policy and administration (X6) leadership (X11) opportunities and advancement (X4) relationships with colleagues (X8) and personnel acceptance (X5) could be written as raw score (B) and standard score (Bata) of the multiple regression equation used to predict the satisfaction of the personnel performance that influences the performance of the employees. After the merger Bank of Ayudhya was selected by using the predictive equation as the following raw score. = (Y) 1.138+.201 (X6)+.155 (X11)+.106 (X4)+.142 (X8) + .087 (X5) Suggestions for further research are as follows. 1. Executives should have a clear salary management policy adequate to ensure a stable working atmosphere and organizational commitment. 2. The organization should foster the motivation for better work performance. 3. The organization should ensure the employees’ confidence that after the business merging the employees will also have the same work stability recognized good working conditions and appropriate welfare for the performance.