The invention discloses a key fixing assembly and a mobile apparatus. The key fixing assembly is used for fixing a key group; the key fixing assembly comprises a shell, a circuit board and a conductive pressing plate; a key mounting hole is formed in the shell; the key group is clamped with the shell in the key mounting hole; the circuit board is laminated on the key group; and the conductive pressing plate is laminated on the circuit board and tightly clamped on the shell to tightly press the key group and the circuit board in the key mounting hole. By virtue of the key fixing assembly, the key group can be fixed while the key function of the key group is remained, so that the key group does not loosen easily.