This study reveals the difference in beliefs and learning experience of non-native Japanese teachers over 10 years by comparing the result of quantitative investigations in fiscal year 2004/2005 and 2014/2015. Through factor analyses of the result of investigations in 2004/2005 (Kubota 2007), two factors; "Accuracy orientation" and "Expressiveness orientation" were found. In this study factor scale scores of these two beliefs factors were calculated. Significant differences in comparisons by region, and weak correlation between "accuracy orientation" and "grammar, translation and memorization type" learning experience were found. In the analysis of investigations in 2014/2015, significant differences of belief factor scores were also found in comparisons by region. As for learning experience, factor scale scores of "grammar, translation and memorization type" were almost the same as the result of investigation in 2004/2005, but factor scale scores for "communicative activity type" were higher than the result of the investigation in 2004/2005. The 2014/2015 study found weak correlation between both beliefs and "composition, presentation and debate type".