1. A microscope apparatus, comprising: a distribution measurement apparatus which—with respect to an observation region wherein a sample is arranged which comprises a fluorescent material that is activated when irradiated with an activating light of a prescribed wavelength, and that emits fluorescence when irradiated in an activated condition with an exciting light of a wavelength that differs from that of the activating light—obtains a fluorescent picture image by conducting irradiation with the exciting light, and measures a fluorescent intensity distribution of the observation region; an irradiation intensity setting apparatus which sets irradiation intensities of the activating light that irradiates the observation region based on the fluorescent intensity distribution; and a picture image formation apparatus which obtains a plurality of the fluorescent picture images by multiply repeating operations comprising an operation wherein the observation region is irradiated with the activating light at the irradiation intensities that have been set, and an operation wherein the observation region is irradiated with the exciting light to obtain a fluorescent picture image, and which generates a sample picture image from the plurality of the fluorescent picture images.