1. A magnetic resonance imaging apparatus comprising: a collection circuitry configured to collect data of an imaging area over a plurality of time phases in a certain respiratory cycle after applying a labeling pulse to a labeling area in which cerebrospinal fluid flows under a task of respiration, wherein the labeling pulse is applied in synchronization with a signal of instruction given to a subject; and a generation circuitry configured to generate images of a plurality of time phases depicting the cerebrospinal fluid by using collected data.