【民法総則】意思表示による権利変動 https://shakaijin-shihoshiken.com/%e3%80%90%e6%b0%91%e6%b3%95%e7%b7%8f%e5%89%87%e3%80%91%e6%84%8f%e6%80%9d%e8%a1%a8%e7%a4%ba%e3%81%ab%e3%82%88%e3%82%8b%e6%a8%a9%e5%88%a9%e5%a4%89%e5%8b%95/