The invention provides a flexible circuit board and a displayer adopting the flexible circuit board. According to the flexible circuit board, installation holes for installing components run into the inner portion of the flexible circuit board. Compared with the prior art, the depth of each installation hole is deeper, so that the installation holes can accommodate the components better, the overall thickness of the flexible circuit board can be reduced, installation space is saved, space utilization rate of the product is improved, and design requirement for smaller or higher-density installation can be met.