To provide a hanging method for a folding door for allowing a worker to perform the work for hanging the folding door easily in accordance with the procedures in one process substantially.

In this hanging method for the folding door, the hanging tool 40 is taken into work site, runner main bodies 6, 6 are put in a condition in which they come closest to each other, the folding door 2 is folded into a V-shape in a plan viewed, folding door fitting parts 43 are fitted into upper end parts of the folding door, respectively, to install the hanging tool 40, then the folding door 2 is pushed in the direction crossing an upper guide rail substantially orthogonally to insert connection shafts 7 into a push guide groove part 46 from an introduction port part 45, a pair of right and left hanging guide main bodies 41A, 41B are displaced in the direction for separating them from each other by inserting the connection shafts 7, pushing of the folding door 2 is inserted continuously, and the connection shafts 7, 7 are automatically guided to connection shaft connection parts of runner mounting implements 8, 8 by elastic restoring force of a connection member 42 when the connection shafts 7 reach an inlet of a connection guide groove part 47.