PROBLEM TO BE SOLVED: To provide a peaking adjusting circuit for preventing frequency characteristics in a high frequency domain of a circuit handling a high-frequency signal from being deteriorated, while reducing power consumption.SOLUTION: A peaking circuit for adjusting peaking of a high-frequency signal includes: a first inductor; a second inductor which is coupled with the first inductor; a signal input section which receives an input signal; a transistor which adjusts a current passing through the second inductor according to the input signal inputted via the signal input section; and a signal output section which outputs a signal whose peaking has been adjusted by the first inductor. Mutual inductance of the second inductor and the first inductor coupled therewith is changed by the adjustment of the current passing through the second inductor is controlled by the transistor according to the input signal inputted from the signal input section, thereby adjusting the peaking of a signal waveform of the current passing through the first inductor, and the signal subjected to the peaking adjustment is outputted from the signal output section.
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