1. An imaging device comprising: an image capturing unit that generates image data by photoelectrically converting, pixel by pixel, a subject image formed on an available pixel area of a light-receiving surface; a noise obtaining unit that reads a noise output only from a partial area of the available pixel area; wherein the partial area from which the noise output is read is a predetermined row and a predetermined column of the available pixel area; a fixed noise calculating unit that calculates an estimation of fixed pattern noise of an entire area of the available area by expanding a regularity of a noise pattern of the partial area throughout the entire area of the available pixel area, the noise pattern being obtained from the noise output; and a noise eliminating unit that subtracts the fixed pattern noise from the image data, and wherein the fixed noise calculating unit calculates an estimation of the fixed pattern noise of an Xth column/a Yth row of the available pixel area based on the noise output of an Xth column of the predetermined row and the noise output of a Yth row of the predetermined column.