Compound line filter

A compound line filter comprising a magnetic core and two coils, wherein:

• the magnetic core is formed into a single body and comprises a closed magnetic path part and a secondary magnetic path part;
• the coils are wound on the closed magnetic path part in a state of being separated from each other;
• the secondary magnetic part is positioned between a first portion of the closed magnetic path part and a second portion of the closed magnetic path part;
• the first portion is positioned between one end portions of the coils;
• the second portion is positioned between remaining one end portions of the coils;
• the secondary magnetic path part protrudes from at least one of the first portion and the second portion toward the other;
• between a tip of the secondary magnetic path part and an opposition part to which the tip is opposite, a clearance is formed;
• when the secondary magnetic path part protrudes from one of the first portion and the second portion, the opposition part is the other of the first portion and the second portion;
• when the secondary magnetic path part protrudes from both of the first portion and the second portion, the opposition part is either of two tips of the secondary magnetic path part;
• and
• a lower limit of a size of the secondary magnetic path part in a first direction perpendicular to a protruding direction in which the secondary magnetic path part protrudes is 0.5 mm.