To provide a semiconductor pressure sensor for high temperature measuring capable of detecting a pressure at high sensitivity with no effect from chemicals even if a gas or liquid whose pressure is to be detected contains the chemicals.

The semiconductor pressure sensor 10 for high temperature measuring is provided with a crystalline sapphire layer 13 on which a pressure- sensitive resistive element 14 is laminated 14, and a body part 11 wherein a bottom part and a hollow part are formed from a titanium alloy as one body, with a notch part 11c provided to the bottom part, and the crystalline sapphire layer 13 is bonded inside. The crystalline sapphire layer 13 works as a pressure- receiving part to detect a pressure applied on the outside of the pressure- receiving part.