A pressure transmitter is disclosed. A pressure measuring portion pressurized by a target fluid that is a target of a pressure measurement and a reference pressure measuring portion pressurized by an external fluid outside a pipe are provided. In addition, a part of the pressure measuring portion that is pressurized by the target fluid and a part of the reference pressure measuring portion that is pressurized by the external fluid are provided inside one thermally conductive member. Accordingly, at the portion pressurized by the target fluid and at the portion pressurized by the external fluid, a difference in temperature between the pressure measuring portion and the reference pressure measuring portion may be insignificantly small. As a result, an accuracy of an operation of correcting an error that may be generated by thermal expansion of the medium fluid in the pressure measuring portion can be improved.