The display device includes: a display panel; a first circuit board having a first portion connected to one portion of the display panel and comprising a connector; and a second circuit board electrically connected to the first circuit board through the connector, wherein the first portion includes a base film, a dummy pad disposed on the base film, and a first solder mask partially covering the dummy pad and exposing a portion of the dummy pad, the dummy pad includes a covered region covered by the first solder mask and an exposed region exposed by the first solder mask, and a solder ball, The exposed region of the dummy pad is connected to the connector through a solder ball.