1. A microscope comprising: a driving controller that changes an image pickup area of a sample; a position detector that detects position information of the driving controller; an image capturing device that captures frame images in the image pickup area; an image generator that pastes together the frame images captured by the image capturing device in the plurality of different image pickup areas, and thereby assembles a pasted-together image; a first correction amount detector that detects a first correction amount for pasting the frame images together from the frame images; a second correction amount detector that detects a second correction amount for pasting the frame images together, by using the position information corresponding to the frame images; and a decision device for correction amount that compares a prescribed value that is set in advance and the first correction amount, and thereby selects one of the first correction amount and the second correction amount, wherein the image generator pastes the frame images together on the basis of the first correction amount or the second correction amount selected by the decision device for correction amount, and thereby assembles the pasted-together image.