The purpose of this study was to determine the effects of expeditionary camp on attitudes toward nature of elementary and junior high school students. Scale of Attitudes toward Nature was administered three times (before camp, just after camp, and 1-month later) to students who participated in Expeditionary Camp (N=69) and Residential Camp (N=60). The scale was also administered two times (before camp and 1-month later) to students who did not participate in camp (N=91). The results were as follows: 1. Total scores of Attitudes toward Nature in Expeditionary Camp were significantly higher than those in Nonparticipants at 1-month later. Comparing each factor, there were significant differences in scores of “positive affect” factor and “camp” factor. 2. Total scores of Attitudes toward Nature in Expeditionary Camp showed significant increase at just after camp and sustained until 1-month later. The other hand, there was no significant change in Residential Camp. Also, total scores in Expeditionary Camp were significantly higher than those in Residential Camp at just after camp, and the difference tended to sustain until 1-month later. Comparing each factor, Expeditionary Camp was significantly higher than Residential Camp in scores of “camp” factor.