A microscope apparatus comprising: an illumination light irradiation unit that irradiates an object to be observed with illumination light adapted for phase-contrast measurement, and wherein the illumination light forms an illumination pattern; a transmission type display unit on which light, which is transmitted through the object to be observed due to irradiation with the illumination light for phase-contrast measurement, is incident, wherein the transmission type display unit is configured to transmit white light in a range of the transmission type display unit that is transparent to light that has all wavelengths included in the light transmitted through the object; and a phase plate provided on a surface of the transmission type display unit opposite to the object Sto be observed, wherein the phase plate has a pattern that is adapted to shift the illumination light that has passed through the object to be observed and is directly incident on the phase plate by a quarter wavelength and is adapted not to change the phase of most of the diffracted light, which is diffracted by the object to be observed; wherein the illumination light has a pattern conjugated with the pattern of the phase plate; wherein the transmission type display unit is disposed at a position optically conjugated with the illumination light irradiation unit; characterized in that the transmission type display unit displays patterns where transmission density varies for every light having a plurality of wavelengths included in the light transmitted through the object to be observed, the displayed patterns comprising a red adjustment pattern configured to adjust the transmission density of red light, a green adjustment pattern configured to adjust the transmission density of green light, and a blue adjustment pattern configured to adjust transmission density of blue light and displayed in the portion of the transmission type display unit other than the range, the adjustment patterns (22a-22c) each having a shape corresponding to the illumination pattern. an illumination light irradiation unit that irradiates an object to be observed with illumination light adapted for phase-contrast measurement, and wherein the illumination light forms an illumination pattern; a transmission type display unit on which light, which is transmitted through the object to be observed due to irradiation with the illumination light for phase-contrast measurement, is incident, wherein the transmission type display unit is configured to transmit white light in a range of the transmission type display unit that is transparent to light that has all wavelengths included in the light transmitted through the object; and a phase plate provided on a surface of the transmission type display unit opposite to the object Sto be observed, wherein the phase plate has a pattern that is adapted to shift the illumination light that has passed through the object to be observed and is directly incident on the phase plate by a quarter wavelength and is adapted not to change the phase of most of the diffracted light, which is diffracted by the object to be observed; wherein the illumination light has a pattern conjugated with the pattern of the phase plate;