The invention provides a terminal device. The terminal device comprises a circuit board component and an antenna; the circuit board component comprises a circuit board and an component on the circuitboard, the antenna is arranged in a first clearance area of the mobile device, and part of the circuit board extends into the first clearance area; the component comprises a plurality of ports including a grounding port, and when the component is arranged on the circuit board, the part, close to or located on the first clearance area, of the component is the part corresponding to the grounding port. The invention further provides the circuit board assembly. According to the terminal device, the clearance area close to the antenna is arranged on one side of the grounding port of the component which is arranged on the circuit board, accordingly, influence of the component which is arranged close to the clearance area to antenna signals can be lowered, and radiated spurious emission of the antenna is lowered.