A connector assembling construction and assembling method

An object of the present invention is to improve operability when two connectors are connected as a module is assembled with a body while being manually moved in horizontal direction. A module M is assembled with a body B by being displaced downward after being substantially horizontally moved by the guidance of a guiding means 10, and the module M is displaced downward to connect the moving-side connector 20 with a waiting-side connector 40. Since the weight of the module M itself acts as a connecting force at the time of connecting the two connectors 20, 40, it can be easily and securely done to assemble the module M with the body B and to connect the two connectors 20, 40 even if a large connection resistance is created between the two connectors 20, 40. Accordingly, operability is good even if the module M is manually moved.