1. A cell peeling recognizing method for imaging an interior of a culture vessel containing culture cells and recognizing a peeled state of cells in the culture vessel on the basis of imaging data captured by an imaging part, the cell peeling recognizing method, comprising: repeatedly moving the culture vessel in a linear direction to sequentially locate multiple spots of the culture vessel within an imaging range of the imaging part by accelerating or decelerating a moving speed of all of the multiple spots of the culture vessel or stopping the culture vessel in the imaging range of the imaging part; imaging the interior of the culture vessel a plurality of times while the cells are moving inside the culture vessel due to the moment of inertia that is generated by one of the acceleration, the deceleration and the stopping of the culture vessel; and recognizing peeled state of the cells by comparing various sets of the captured imaging data that are captured at all of the multiple spots of the culture vessel.