A pressure sensor has a joint (1) having a pressure port (13), a pressure detecting device (2) bonded to the joint (1) to convert fluid pressure to an electric signal and a housing (5) provided to an output side of the pressure detecting device (2), the pressure sensor further including a flange member (3) bonded to the joint (1) and having a through-hole (26) for the pressure detecting device (2) to be inserted and a connector (6) bonded to the flange member (3) to fix the housing (5).