<p>This portable wireless device (100) is provided with: a shield pattern (170) that covers a microphone (150) and a microphone signal line (140); cutoff circuits (L1, L3, L4) that are loaded on the microphone signal line (140); and a cutoff circuit (L2) that is loaded between the shield pattern (170) and the ground of a circuit board (130). The cutoff circuits (L1-L4) have a low impedance in a voice band and a high impedance in a communication band, and cut off high-frequency signal input to the microphone (150). The shield pattern (170) covers the microphone signal line (140) and the microphone (150) at the minimum width in a manner so as to minimize the electrical length in the high-frequency band.</p>
