The invention relates to the guide part and the driving rod of a harness frame which may separate from the harness frame easily and make the installation of the harness frame more easier in the case of coupling the harness frame on warp yarn opening device which is arranged on the driving rod reciprocating up and down in the aid of the drive source. Loosen bolt (5) to relieve the bonding of the side brace (2) and the driving rod (3). Then loosen the bolt (38) of semi- body part (36) to relieve the bonding of the cylinder (22) and the fixed axis (34). Under this state, make the guide mechanism(10) incline towards the right using the connection portion as the center. And then, use the space (31a) between fixed axis and the inner wall of the cylinder (31) to allow the cylinder to occur the change of height position on up and down direction relative to the fixed axis. Therefore, the cylinder can incline relative to the fixed axis as well as move to the frame (18) side. As a result, guidepart (26) inclines to the retreating position of the frame side to be static, so a large space is formed between the guide part and the harness frame (1).