A hydraulic pipe fixing apparatus for a boom-swing type excavator is disclosed, which makes hydraulic hoses for attachments and hydraulic hoses for additional option devices be arranged in predetermined positions inside a boom supporter (4). The hydraulic pipe fixing apparatus includes a clamp on which seating grooves for seating hydraulic hoses for attachments and hydraulic hoses for option devices are formed so as to arrange the hydraulic hoses for the attachments including the boom and the hydraulic hoses for the additional option devices in predetermined positions inside the boom supporter, and a cover for fixing the hydraulic hoses that is detachably fixed to the clamp by a fastening member so as to prevent the hydraulic hoses from seceding from the seating grooves and to intercept mutual contact of a boom cylinder fixing member and the hydraulic hoses for the attachments and the option devices that move toward the boom cylinder side when hydraulic fluid is supplied to the hydraulic hoses for the attachments and the option devices.