In order to fix the tension of the wire without any increase in the tension of the wire, the joint mechanism (1) according to the present invention has one end fixed to the first joint member (2), the second joint member (3) and the second joint member (3), which are swingably connected together A long tension transmitting member (4, 5) for swinging the second joint member (3) by tension with respect to the first joint member (2), and movably provided to the first joint member (3), and a tension transmission member (4), andWhen the tension of 5) is increased, it is moved in the direction crossing the longitudinal direction of the tension transmitting member (4, 5) by the tension transmitting member (4,5) to be pressed against the second joint member (3), whereby the first joint member (2) and the second joint A joint fixing member (9, 10) for fixing the node member (3) is provided.ワイヤの張力を増大させることなく任意の湾曲状態で固定することを目的とし、本発明に係る関節機構(1)は、揺動可能に連結された第1関節部材(2)および第2関節部材(3)と、第2関節部材(3)に一端が固定され、第1関節部材(2)に対して第2関節部材(3)を張力により揺動させる細長い張力伝達部材(4,5)と、第1関節部材(3)に移動可能に設けられ、張力伝達部材(4,5)の張力が増大させられたときに張力伝達部材(4,5)によって、張力伝達部材(4,5)の長手方向に交差する方向に移動させられて第2関節部材(3)に押し付けられることにより、第1関節部材(2)と第2関節部材(3)とを固定する関節固定部材(9,10)とを備える。
