one embodiment fig1 shows the configuration example when an imaging sensor 12 of an electronic camera is set as an output device and a signal processing circuit 13 of the electronic camera is set as an input device the imaging sensor 12 of the one embodiment has a light receiving surface on which a plurality of light receiving elements are two dimensionally arranged and outputs an image signal of a subject image which is image formed on the light receiving surface with an imaging optical system not shown further the imaging sensor 12 has an a d conversion circuit not shown on a chip and a digital data signal is output from an output terminal of the imaging sensor 12 here to the imaging sensor 12 of the one embodiment one ends of a plurality of signal lines which serially transfer image signals details will be described later and one end of a signal line clk which outputs a clock signal are coupled the other ends of the aforementioned respective signal lines are coupled to the signal processing circuit 13 respectively and through a data transfer between the imaging sensor 12 and the signal processing circuit 13 the image signals can be transferred in a serial scheme using the plurality of signal lines note that the imaging sensor 12 also has a function of outputting later described test data to the plurality of signal lines the signal processing circuit 13 is a digital front end circuit which performs various.