The aim of this paper was to investigate the consciousness of learning sewing of home economics and self-efficacy of junior high students before and after the learning, and to clarify the relation between the consciousness of the learning and self-efficacy and the transformation before and after the learning through the observation of a teacher and students in class. For the first graders of W Junior High School in K City of Hiroshima (57 boys and 44 girls), I investigated before and after the learning for all 12 hours of sewing the book jacket that was introduced a portfolio considered to be effective for self-evaluation (September 2012 and January 2013). The investigation items were 21 items to ask the consciousness of the acquisition of the sewing skills and 18 items to ask the generalized self-efficacy with four phases of all evaluations. Furthermore, I extracted the students who had either high and low feeling of the generalized self-efficacy, and observed their behavior in class (October and November 2012). On the basis of these results, I analyzed the relation between the items by Pearson's correlation coefficient and catched a characteristic of the portfolio and the behavior in class of the extracted students. The generalized self-efficacy was high as the student whom the self-evaluation of the skill was high. After the learning the self-evaluation of many skills became higher. In addition, there was seen a difference in the score of the challenge factor of self-efficacy before and after the learning, increased after the learning. By the pitch of self-efficacy, a difference was seen in the description of the portfolio and a behavior in class.