To provide a ring for a differential pressure/pressure transmitter having a structure for performing highly accurate measurement by surely preventing foreign matter and deposit from sticking to a liquid-contacting diaphragm while preventing the diaphragm from being deformed or broken in cleaning, and facilitating the removal of air and drain.

A pressure receiver 10 having the liquid-contacting diaphragm 9 and the ring 20 with a filter 36 built therein are fixed to a pressure take-out part 4 of a tank 1 with a plurality of bolts 37. The filter 36 removes foreign matter and deposit in a liquid 2 therefrom to prevent them from sticking to the liquid-contacting diaphragm 9. Further, it prevents a cleaning liquid from directly hitting against the diaphragm 9 in cleaning the interior of the tank 1. Furthermore, the ring 20 has a hole 44 for drainage and a hole 45 for evacuation formed therein.