In a binding machine, a mounting angle of a guide member (8) for forming a wire (3) into a loop is made adjustable to reduce worked precision require for the member. Two guide pins (11, 12) erected from a guide plate (7) projecting form the binding machine body are respectively housed in guide pin fitting holes (13, 14) formed in the guide member (8), and the guide member (8) is fixed by screwingfixing screws (23a, 23b) to the guide pins (11, 12). One guide pin (12) is loosely fitted into its corresponding guide pin fitting hole (14), and the tip ends of embedded screws (22a, 22b) screwed into screw holes (20, 21) penetrating the inner side surface of the guide pin fitting hole (14) and the outer side surface of the guide member (8) are brought into contact with the peripheral surface ofthe guide pin (12) to adjust an angle of the guide member (8) with respect to the guide plate (7).