Abstract: A pressure detection apparatus is provided with a semiconductor pressure sensor interposed between a reference pressure side and a measured pressure side and adapted to detect pressure in fluid corresponding to the difference between the reference pressure and the measured pressure. In addition, the apparatus is connected to an output side of the semiconductor pressure sensor and also includes a sensor offset compensation circuit for adjusting an output value from the semiconductor pressure sensor at a predetermined temperature to provide zero-point temperature compensation, thereby making it possible to compensate for an offset value of the semiconductor pressure sensor. This apparatus is not affected by the external atmospheric temperature, thus enabling it to provide fully stable operation.