To evaluate the fixing property of a toner quantitatively and objectively.

In this method for evaluating the fixing property of a toner based on the peeling state of the toner in a crease by creasing recording paper onto which toner is fixed, image data obtained by photographing an area including the crease of the recording paper is inputted (S01), the number of low density pixels having density equal to or under specified threshold density is counted in the specified evaluation area of the image data, and the number of the low density pixels per unit length being the ratio of the number of the low density pixels to the number of pixels in the crease direction of the evaluation area is calculated so as to obtain the peeling level of the toner based on the number of the low density pixels per unit length (S02), and the fixing property of the toner is evaluated according to the peeling level (S03).