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A model of customer’ expectations of service quality for public mini bus service was developed and validated, based on the concepts of SERVQUAL model (Parasuraman, 1991). The sample consisted of 400 passengers in Eastern of Thailand. The research instrument was a Five-point Likert scale. The model was validated using second-order confirmatory factor analysis through Mplus program version 7.0.

The research results indicated that customers’ expectation towards the quality of public mini bus service consisted of five factors. In order of factor loading they were: tangibility, responsiveness, reliability, assurance, and empathy. The validation of the model provided

= 24.588, df = 20, p = 0.2177, CFI = 0.999, TLI = 0.996, RMSEA = 0.026, SRMR = 0.018. Keywords: service quality, expectation, second-order confirmatory factor analysis