COMMON MODE FILTER

PROBLEM TO BE SOLVED: To provide a common mode filter that allows a manufacturer to suppress increase in manufacturing costs.SOLUTION: A common mode filter comprises: a first coil C1 connected with a first input terminal electrode and a first output terminal electrode; and a second coil C2 connected with a second input terminal electrode and a second output terminal electrode. The first and second coils C1, C2 are placed such that they are adjacent to each other in a stacked direction of a plurality of insulator layers 10 and have a part where the direction of current is the same. The first coil C1 includes a plurality of first conductors 11, 12 placed inside of an element assembly 2 and a first connection conductor 7 placed on the outer surface of the element assembly 2 and serially connecting the plurality of first conductors 11, 12. The second coil C2 includes a plurality of second conductors 21, 22 placed inside of the element assembly 2 and a second connection conductor 8 placed on the outer surface of the element assembly 2 and serially connecting the plurality of second conductors 21, 22.