Pressure-detecting device

A pressure-detecting device (10) comprising a pressure-detecting element (21) and a processing circuit (30). Upon being subjected to pressure (P), the pressure-detecting element (21) outputs a detection signal (Qi) corresponding to said pressure (P), and the processing circuit (30) processes the detection signal (Qi) outputted by the pressure-detecting element (21) and outputs the result. The processing circuit (30) has an integrated circuit (IC1) mounted on a circuit board (40) on which a conductor pattern is formed. Said integrated circuit (IC1) contains an analog circuit that converts the detection signal (Qi) to a voltage waveform, using a reference voltage (Vr) set to a prescribed voltage value as an operating reference. The processing circuit (30) also has an input circuit (50) and a shielding pattern (SHP1). The input circuit (50) feeds the detection signal (Qi) to the integrated circuit (IC1), and the shielding pattern (SHP1), to which the reference voltage (Vr) is applied, surrounds at least part of