Disclosed is a thin type electronic instrument having a structure comprising a circuit base plate for mounting an integrated circuit chip thereon and a power source battery for supplying power to the circuit base plate sandwiched between a pair of synthetic resin sheets opposed to each other, with the pair of synthetic resin sheets being plastered at the peripheral portions thereof, characterized in that a substrate made of a metal is interposed between the pair of synthetic resin sheets.
The thin type electronic instrument of the present invention is improved in mechanical durability against mechanical shock such as warping or torsion by a stress during carrying or usage, whereby erroneous actuation or breaking can be inhibited.