PURPOSE: To make it possible to simply connect a unitconstituting body with a wire harness assembly with reliability.

CONSTITUTION: The terminal hardware 31A of a wire harness assembly WH is divided in accordance with the contactors 731 of a unit-constituting body 700 to which the terminal hardware 31A is to be connected. The divided pieces of the terminal hardware 31A are arranged in accordance with the arrangement of the corresponding contactors 731, and temporarily held. While being temporarily held, the terminal hardware 31A is passed to the contactors 731. Thus the divided pieces of the terminal hardware 31A are arranged in an intended pattern, and the terminal hardware in the intended arrangement is passed and connected to the contactors 731. This reduces erroneous arrangement and further improves workability.