A common mode filter (101, 102, 103, 104, 106) including a differential transmission line comprising a first signal line and a second signal line, a first inductance element arranged in series in the first signal line, a second inductance element arranged in series in the second signal line, and a ground as a reference with respect to the first signal line and the second signal line, the common mode filter comprising: a first resonant circuit arranged between the first inductance element and the ground; and a second resonant circuit arranged between the second inductance element and the ground, wherein: the first resonant circuit includes an LC series circuit and comprises a first capacitance element connected to the first inductance element; the second resonant circuit includes an LC series circuit and comprises a second capacitance element connected to the second inductance element; the first resonant circuit further comprises: a third inductance element arranged between the first capacitance element and the second capacitance element; and a fourth inductance element arranged between the second capacitance element and the ground; and the second resonant circuit further comprises the fourth inductance element, the fourth inductance element is arranged between a connection point and the ground, the connection point connecting the second capacitance element and the third inductance element. a first resonant circuit arranged between the first inductance element and the ground; and a second resonant circuit arranged between the second inductance element and the ground, wherein: the first resonant circuit includes an LC series circuit and comprises a first capacitance element connected to the first inductance element; the second resonant circuit includes an LC series circuit and comprises a second capacitance element connected to the second inductance element; the first resonant circuit further comprises: a third inductance element arranged between the first capacitance element and the second capacitance element; and a fourth inductance element arranged between the second capacitance element and the ground; and the second resonant circuit further comprises the fourth inductance element, the fourth inductance element is arranged between a connection point and the ground, the connection point connecting the second capacitance element and the third inductance element. the first resonant circuit includes an LC series circuit and comprises a first capacitance element connected to the first inductance element; the second resonant circuit includes an LC series circuit and comprises a second capacitance element connected to the second inductance element; the first resonant circuit further comprises: a third inductance element arranged between the first capacitance element and the second capacitance element; and a fourth inductance element arranged between the second capacitance element and the ground; and a third inductance element arranged between the first capacitance element and the second capacitance element; and a fourth inductance element arranged between the second capacitance element and the ground; and the second resonant circuit further comprises the fourth inductance element, the fourth inductance element is arranged between a connection point and the ground, the connection point connecting the second capacitance element and the third inductance element.