Although laparoscopic surgery is less invasive than laparotomy, it leaves four or five surgical wounds in the abdomen, and patients for whom postoperative cosmetics are important are reluctant to undergo surgery. Laparo-endoscopic single site surgery has the advantage of using the umbilical hole to perform the surgery, leaving only one surgical wound and providing excellent postoperative cosmetics. On the other hand, it has the disadvantage of high operative difficulty due to the concentration of instruments in a single location. Therefore, in this study, I will develop a new bending forceps that solves the disadvantages of laparo-endoscopic single site surgery and achieves a surgical sensation equivalent to that of conventional laparoscopic surgery. In this paper, the characteristics and mechanism of the forceps to be developed are described, and the performance of the fabricated leaf springs and torque coils are quantitatively evaluated.