There is provided a differential ring oscillation circuit including a differential ring oscillation unit in which delay circuits, to which signals of 2 phases are input, and which delay and output the input signals of 2 phases, are connected at even stages in a ring form, first and second common-mode level detection units that detect that the input signals of 2 phases of one delay circuit at an even stage of the differential ring oscillation unit and the input signals of 2 phases of one delay circuit at an odd stage of the differential ring oscillation unit are at same predetermined levels, respectively, and first and second switches that set, to specific potentials, one of the output signals of 2 phases of the delay circuit delaying the input signals of 2 phases, when the first and second common-mode level detection units detect the same predetermined levels, respectively.