Directional coupler

A directional coupler for use in a predetermined frequency band, comprising:

• a laminate body including a laminate of a plurality of insulation layers;
• a first terminal through a fourth terminal disposed on a surface of the laminate body;
• a main line connected between the first terminal and the second terminal and disposed on at least one of the insulation layers;
• a first sub-line disposed on at least one of the insulation layers, connected to the third terminal, and electromagnetically coupled with the main line;
• a second sub-line disposed on at least one of the insulation layers, connected to the fourth terminal, and electromagnetically coupled with the main line;
• and
• a phase adjusting circuit connected between the first sub-line and the second sub-line and configured to cause a phase shift in a passing signal,
• wherein the main line, the first sub-line and the second sub-line do not overlap each other in a plan view from a direction of lamination.