Multilayer substrate

A multilayer substrate comprising:

• a laminate substrate in which a plurality of insulating layers are laminated, the laminate substrate including a first main surface and a second main surface;
• and
• an alternating current signal line in the laminate substrate;
• wherein
• the alternating current signal line includes a plurality of signal lines spaced apart from each other in a thickness direction of the laminate substrate, and the plurality of signal lines are electrically connected by a plurality of connection conductors penetrating one of the plurality of insulating layers in the thickness direction of the laminate substrate;
• the plurality of signal lines include:
• a first signal line closest to the first main surface of the laminate substrate in the thickness direction of the laminate substrate;
• a second signal line closest to the second main surface of the laminate substrate in the thickness direction of the laminate substrate;
• and
• a third signal line located between the first signal line and the second signal line in the thickness direction of the laminate substrate;
• and
• at least one of a thickness of the first signal line or a thickness of the second signal line is larger than a thickness of the third signal line in the thickness direction of the laminate substrate.