A circuit board according to an embodiment includes a first insulating layer; and a second insulating layer disposed on the first insulating layer and including a cavity; wherein the second insulating layer includes a lower surface of the cavity positioned higher than an upper surface of the first insulating layer, wherein the lower surface of the cavity includes: a plurality of first portions, and a plurality of second portions provided between the plurality of first portions and having a height different from that of the plurality of first portions, and wherein a height difference between a portion having a highest height and a portion having a lowest height of the plurality of first portions is 1 μm or less.