NOVELTY - The mast has support panels (32) connected in a longitudinal direction of a module in conjunction with one of the two ends of each of a set of bending parts (31b), where outer surfaces (32c) of the support panels of two adjacent corners pass through a same plane. Elongated connecting panels (33) are connected at ends (33a) to the corresponding support panel of the adjacent corners. Reinforcing elements (36) are fitted in conjunction with an outer edge (30a) of a corner panel (30) and an outer edge (31a) of a pivot panel (31).    USE - Cross hatching structured mast for a wind power plant located in sea. Can also be used for erection on land and base station.    ADVANTAGE - The joint of the support panels is formed such that the outer surfaces of the support panels of adjacent corners pass through the same plane, and an inner edge of the support panels is bent to increase the rigidity of the support panel. The mast comprises joining panel with openings, which are aligned with the openings provided in the connecting panels when the joining panel is mounted in a place, so that the connecting panels and the joining panel can be connected to each other by screw-and-nut joints through the openings and a cross hatching structure so as to be made rigid. The mast makes each part of a modular element to be easily joined with a mechanical joining unit and avoids welding work during manufacture of parts or the assembly of the mast. The module elements can be brought to a location of the mast for assembling easily, so that the mast can be mounted to a place in an easy manner.    DESCRIPTION OF DRAWING(S) - The drawing shows a partial-sectional view of a cross hatching mast module.    Corner panel (30)    Outer edge of corner panel (30a)    Pivot panel (31)    Outer edge of pivot panel (31a)    Bending parts (31b)    Support panels (32)    Outer surfaces of support panels (32c)    Elongated connecting panels (33)    Ends of connecting panels (33a)    Reinforcing elements (36)