National Museum of Marine Science & Technology (NMMST) was opening in January 2014. NMMST designs environmental education courses with marine environmental education characteristics to have it become an environmental field for outdoor education in Keelung. This questionnaire survey is proceeded to understand the perceived service quality and satisfaction to elementary school teachers in Keelung using NMMST as the outdoor education place. The teachers of 42 elementary schools in Keelung are sampled for the survey. Total 881 copies of the questionnaire are distributed, and 484 valid copies are retrieved, with a retrieval rate 54.9%. The research results reveal that most satisfied with the respondents is the overall environment of the museum clean and comfortable, and space makes feel comfortable and safe. The most dissatisfied is the display area seating is insufficient, the museum staff to actively promote the activities. In the factor analysis of service quality satisfaction, the research shows that a significant difference in gender, teacher seniority, whether or not the State Education Tutoring Group, and the administrative regions of the school location. In addition, 88.6% of teachers use guided commentary and study sheets as the way to learn outside the classroom in NMMST. It shows that teachers rely heavily on the NMMST Navigator's services and are more concerned with their professionalism and service attitude. This study found that services have room for improvement, which influenced by NMMST's outsourcing operation mode. This should be the key point that the government must take into account when it takes over the operation of the NMMST.