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By introducing a numerical image processing technique, the resolution of scanning SQUID microscope (SSM) has been improved beyond the “naive” limit determined by the size of the pickup (sensor) coil. Our image processing is developed by taking account of the specific characteristics of SSM apparatus, including detailed shape of the coil and its perfect diamagnetism, in a tailor-made manner. The actual experiment has been done for nano-scale superconducting Pb network, and the magnetic field structures apparently smaller than the size of the pickup coil were made visible by our method.