Multilayer substrate

A multilayer substrate comprising:

• a laminated body including a plurality of base material layers laminated to each other;
• and
• a differential line provided on or in the laminated body and including a first line conductor and a second line conductor;
• wherein
• the differential line includes a plurality of line portions provided in different layers and extending in a plane direction of the plurality of base material layers, and a connecting portion that connects the plurality of line portions to each other;
• the connecting portion includes:
• a plurality of first parallel conductors extending in parallel or substantially in parallel with each other;
• a plurality of first interlayer connecting conductors that connect the plurality of first parallel conductors in parallel, and connect the first line conductor to the plurality of first parallel conductors;
• a plurality of second parallel conductors extending in parallel or substantially in parallel with each other;
• and
• a plurality of second interlayer connecting conductors that connect the plurality of second parallel conductors in parallel, and connect the second line conductor to the plurality of second parallel conductors;
• and
• the plurality of first parallel conductors cross the plurality of second parallel conductors, as viewed in a laminating direction of the plurality of base material layers.