A rotary shaft wire passage structure includes a pivot pin and a pivot seat respectively fixedly connected with a pivotal rotary member and a relative pivotal rotary member. The pivot pin has a pivoted section and an annular raised section disposed at one end thereof. The pivoted section is formed with an axial through hole in full communication with outer side via a split. The pivot seat has a shaft hole in which the pivoted section is fitted. One side of the shaft hole is formed with a fissure in communication with the outer side. The fissure is adjustable to a position where the fissure is aligned with the split for placing a wire into the through hole. When the relative pivotal rotary member is pivotally rotated to a working position by a certain angle, the fissure is misaligned from the split to prevent the wire from slipping out.