A new type of confocal fluorescence microscope with an unprecedented resolution is proposed. Calculations demonstrate that an axial resolution on the order of 100 nm can be achieved in a confocal microscope with enlarged aperture when two-photon excitation is applied. This axial resolution is up to four times higher than that of a confocal fluorescence microscope. The proposed microscope yields the highest point resolution ever achieved in far-field light microscopy.