1. A microscope device comprising: an observation optical system that is capable of acquiring an image of a sample; a stimulation optical system that is disposed independently of the observation optical system and that irradiates the sample with light to stimulate the sample; a field-of-view displaying unit that displays, superimposed on the image acquired by the observation optical system, an indication indicating a maximum field of view of the stimulation optical system; a region specifying unit that specifies a stimulation region to be stimulated by the stimulation optical system on the image acquired by the observation optical system; another stimulation optical system; a plurality of light-path combining units that combine a light path of the observation optical system with light paths of the stimulation optical systems; a switching unit that allows selective insertion or removal of the light-path combining units into or from the light paths; and a storage unit that stores offset amounts between the light paths for the individual light-path combining units, wherein the field-of-view displaying unit corrects a position of the indication indicating the maximum field of view of the stimulation optical system based on an offset amount for a corresponding light-path combining unit selected by switching with the switching unit.