PROBLEM TO BE SOLVED: To provide an endoscope apparatus and an endoscope diagnostic apparatus capable of distinguishably displaying an expressing tissue from a lesion part or the like by obtaining an image of polarization characteristics by predetermined polarization characteristics.SOLUTION: The endoscope apparatus provided with an insertion part to be inserted into a subject body includes three or four types of polarization reserving fibers which guide three or four types of linear polarizations each having different polarization angles up to a leading end part of the insertion part, while maintaining the polarization angles.
