The present invention relates to a device for fixing a joint structure. The device for fixing a joint structure, according to one aspect of the present invention, comprises: a first slider for fixing a first directional joint movement state of a joint structure that includes a first joint element and a second joint element a first locking member included in the first slider and a first corresponding locking member which operates relative to the first locking member and blocks a forward directional movement and a backward directional movement of the first slider.
