We performed a trip class on astronomy for 7th-grade students. By analyzing the questionnaire, we investigated, (1) whether this kind of single trip class could improve the learning attitude for astronomy, and (2) for science on the whole, and (3) which of factors, enjoying the class and being easy to understand, correlated with the improvements much. We showed that (1) the class surely improved the learning attitude for astronomy, and (2) even for science on the whole, and that (3) the factor of being easy to understand tends to be more important than the factor of enjoying the class.