PROBLEM TO BE SOLVED: To provide a plant supporting device improved in insufficiency in a technological idea of preparing a multi-purpose set of the plant supporting device for facilitating sales promotion because conventional patented technologies relating to a supporting device for climbing plants are generally developed each for a single purpose, so as to be applicable to extremely multipurpose use and enable an ordinary person to buy standardized parts at a do-it-yourself store or the like to flexibly, easily and finely set a full-scale arch, rack, wall-surface greening, fence or the like on her (his) own. SOLUTION: The plant supporting device employs means any pieces of which can be connectedly engaged with one another in good dimensional accuracy at metal pipe parts of base net bodies in the upper and lower sides of the base net bodies obtained by welding the metal pipes at the side surface of a square net body formed by welding a metal wire into a net state, and are usable as the full-scale arch, rack, wall-surface greening, fence or the like using various kinds of standardized parts to be connected to the base net bodies. COPYRIGHT: (C)2009,JPO&INPIT