The purposes of this descriptive research were to study primary care service quality as expected and perceived by clients at primary care unit in community,Samutprakarn province. The samples were 450 clients that selected through purposive technique follow the criteria of population. The questionaires were adapted from SERVQUAL which was developed by Parasuraman et al (1988) and measured client’ expectation and perception of the quality of primary care service concretely.The questionaire was assessed for content validity by 5 experts, and the reliability of expectation and perception the obtained by Cronbach’s alpha coefficient which was 0.97 and 0.96, respectively. The data were analyzed by SPSS 7.5 for Windows in means, percentage, standard deviation, and Paired t-test.The research results revealted the following content ;

1. Primary care service quality as client’s expected at primary care unit in community of Samutprakarn province was the highest level for overall quality and quality of each dimension. The expectation for each item was high to highest level.
2. Primary care service quality as client’s perceived at primary care unit in community of Samutprakarn province was the highest level for overall quality and quality of each dimension. The perception for each item was high to highest level.
3. Primary care service quality as expected and perceived by clients at primary care unit in community of Samutprakarn province was significantly at the level of 0.05, in that means of expectation is highest than means of perception for overall quality and quality of each dimension and each item.

These results of the research indicated that client expectation was higher than their perception of quality of primary care service they received. Therefor the administrator and staffs should plan to develop primary care service quality to meet client expectation in order to get their satisfaction and delight in the future.