PURPOSE: To provide a signal conversion device which is optimum for being capable of eliminating an influence due to a pyroelectric property and of capable of enhancing an S/N ratio in the signal conversion device such as a pressure sensor, an acceleration sensor or the like. ;CONSTITUTION: A piezoelectric output body 20 is constituted in such a way that piezoelectric element plates 24a, 24b are arranged and installed at the upper part and the love part of a conductive mass transfer body 21 so as to make their polarization directions identical. It is sandwiched and held inside a mounting body, internal electrodes for the piezoelectric element plates 24a, 24b at the upper part and the lower part are connected electrically to the mass transfer body 21, and signals are taken out electrically from inside and outside electrodes. Thereby, even when electric charges are generated respectively by a pyroelectric property in the piezoelectric element plates 24a, 24b which are arranged at the upper part and the lower part of the mass transfer body 21, they are offset from each other because different poles are electrically connected respectively, and a noise due to the pyroelectric property can be lowered.;COPYRIGHT: (C)1995,JPO
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