PROBLEM TO BE SOLVED: To raise the accuracy of discriminating a plant from other plants.SOLUTION: A plant discrimination device 100 according to the present invention determines, with regard to a set of first and second center values for pixels on the image of hyper spectrum data 141, whether or not the first center value multiplying by a prescribed coefficient is smaller than the second center value. When the first center value multiplying by a prescribed coefficient is smaller than the second center value, the plant discrimination device 100 excludes the relevant pixel from the hyper spectrum data 141.SELECTED DRAWING: Figure 1