The present invention relates to a coil substrate. The coil substrate comprises: a substrate; a first spiral pattern which is disposed on a first surface of the substrate, and has a partially cut spiral shape; a second spiral pattern which is disposed on a second surface of the substrate, and has both ends electrically connected to the first spiral pattern; and a leading pattern which has one end connected to the first spiral pattern, and is disposed to cross a cut portion of the first spiral pattern from inside to outside of the first spiral pattern, wherein the cut portion of the first spiral pattern is electrically connected by multiple first via portions and the second spiral pattern.
