To provide a maintenance construction method which can be performed, by one elevator for maintenance constructed on one rack rail and few work process persons.

In the maintenance construction method for a windmill blade 102a of wind-power generation equipment, a rack rail constructing plate 30 of the prescribed length in which strong magnets 20 are fixed at both ends is fixed to an outer peripheral plane of a wind-power generation tower 101 keeping the prescribed interval, at the rack rail 10 stood vertically near a base end of the outer peripheral plane of the wind-power generation tower 101, the rack rail 10 is stood vertically, an elevator 50 for maintenance joining integrally a driving device 40 for elevation is installed, the rack rail constructing plate 30 is sequentially fixed riding on the elevator 50 for maintenance, the rack rail 10 is extended to the upper part, the rack rail 10 is added to the peak end of the wind-power generation tower 101, a work bench 70 for inspecting blades is coupled to a driving device 40 of the elevator 50 for maintenance, then, repairing can be performed from a tip of a blade to a root by moving the work bench 70 for inspecting blades.