The endoscope apparatus includes a wavelength switching unit for switching emission wavelengths of a first illumination light including at least broadband light and a second illumination light including only plural kinds of narrowband light, an imaging unit for capturing an image of a subject by the first illumination light or the second illumination light having the switched emission wavelength in each imaging frame, an acquisition unit for acquiring biological information relating to form and/or function of a biological object serving as the subject and a mode switching unit for switching at least two diagnosis modes based on the biological information. The number of imaging frames by the imaging unit in which the emission wavelengths of the first and second illumination light are switched varies depending on the diagnosis mode.