An electronic circuit of at least one embodiment of the present invention includes: a plurality of electronic parts, of the plurality of electronic parts, at least one electronic part being at least one main part and the other electronic parts being auxiliary parts, the at least one main part being necessary for determination of whether or not the electronic circuit operates normally, the auxiliary parts being unnecessary for determination of whether or not the electronic circuit operates normally, the auxiliary parts being connected to a line which is connected to the at least one main part so as to supply a signal necessary for operation of the at least one main part or output a signal obtained by the operation of the at least one main part. This provides an electronic circuit which is capable of properly detecting a circuit wiring disconnection and easily detecting faulty wiring between elements without the need of providing the electronic circuit with more components for detecting a circuit wiring disconnection.