To provide a remote seal type pressure/differential pressure transmitter superior in property stability by solving property instability due to hydrogen discharged from constituent materials.

A flange part 3a is divided into a part having a pipe 33 for filling a filler liquid 4 in and a part having a seal diaphragm 32. A space including a hydrogen absorptive member 34 is formed between the parts and made to include the hydrogen absorptive member 34, and the parts are airtightly welded to each other at their circumferential parts. A through hole for filling the filler liquid 4 in is formed in the center of these three members. The hydrogen absorptive member 34 absorbs hydrogen discharged into the filler liquid 4 when heated by a high-temperature process fluid in contact with the seal diaphragm 32 to stabilize properties. It is effective to provide the hydrogen absorptive member for a terminal of a capillary part 2 on the side of the flange part.