PURPOSE: To avoid the effect of temperature even though constituent members are changed due to the change in ambient temperature, by forming symmetrical right and left pressure detecting chambers at the central part of a body, and forming two pressure actuating chambers having the same shape at both sides.

CONSTITUTION: A pressure transmitting device 1 has a structure having symmetrical right and left parts. A movable electrode 3 comprising a thick plate spring is provided at the central part of a body 2. Symmetrical right and left pressure detecting chambers 2a are formed at the central part of the body 2 by a flange 3a of the movable electrode 3. Recesses, whose diameters are the same as those of communicating paths 2b and 2c are formed in both attachments 7 and 8. Thus a pressure acting chamber 7a on the process side and a pressure acting chamber 8a on the atmospheric side are formed. In this constitution, even though the constituent members are changed due to the change in ambient temperature, the deformations are offset at the right and left sides, and the effect of the temperature can be avoided.