Positive changes have been observed in pupils' "interests in science museums" through activities of single-visit programs. In this paper, factors of change in attitude of pupils in the program are analyzed from the viewpoint of learning resources in science museums. Firstly, it is shown that there are two kinds of learning the resources at science museums useful for schools, which are "objects" and "staff expertise." Then, relationship between learning resources in science museums and changes in attitude of pupils is examined. Finally, it is statistically shown that pupils' "interest in science museums" is affected by learning resources.