It is an object of the invention to provide an opening/closing rear component structure of a vehicle, comprising a luggage space being divided into a upper luggage space and a lower luggage space, a openable/closable door being provided to the upper luggage space and the lower luggage space respectively, and the door for the upper luggage space and the door for the lower luggage space being adapted to selectively adopt either a mode of opening/closing the door for the upper luggage space and the door for the lower luggage space integrally so that the upper luggage space and the lower luggage space may be opened/closed at the same time, or a mode of, opening/closing the door independently so that the upper luggage space and/or the lower luggage space may be opened/closed, whereby it becomes possible to selectively adopt an independent luggage space separated from the compartment (such a luggage space as a sedan-type vehicle has) or a large luggage space in which large luggage can be loaded and unloaded easily (such a luggage space as a hatchback-type vehicle has), and it becomes also possible to keep the air-conditioning from lessening its effect when the independent luggage space is opened/closed, and also possible to store, for example, dirty luggage and the like in the independent luggage space.