1. An image processing device comprising: a detection unit for detecting blurring of an image picked up with an imaging element; a simplified calculation unit for calculating an intermediate value of evaluation data of the picked-up image in parallel with a detecting operation of the detection unit; a memory for memorizing a calculation result of the simplified calculation unit; and a final calculation unit for calculating a final value of the evaluation data from the intermediate value of the evaluation data memorized in the memory based on the blurring detected with the detection unit after completion of the detection with the detection unit.