A printed circuit board (PCB) includes first to fourth layers. A power supply is arranged on the first layer. An electronic component is arranged on the fourth layer. A first via and a second via extend through the PCB and are electrically connected to the electronic component. The PCB further includes third to seventh vias. A length of a transmission path of the current flows from the power supply to electronic component through the third via and the seventh via is almost the same as a length of a transmission path of the current flows from the power supply to the electronic component through the fourth to sixth vias.