A filtration filter device that enables an object filtered and left on a filtration filter to be more readily observed is provided. The filtration filter device includes a filtration filter that filters an object contained in a fluid, a holding member that holds an outer circumferential portion of the filtration filter, and a tubular member that is removably mounted on the holding member such that a hollow portion that serves as a channel through which the fluid flows faces at least a part of a main surface of the filtration filter.