A PCB fixing device includes a case having a plurality of sliding holes spaced apart from each other, and a plurality of fixing members engaged with and movable along the sliding holes, and configured to couple with edges of a PCB to fix the PCB to the case. Accordingly, the position of the PCB fixing device can be adjusted according to the size of the PCB by moving the fixing member along the sliding hole. The PCB fixing device is applicable to PCBs of various sizes and structures, and can reduce loss resulting from a change in the specification of a PCB.