A video imaging device comprising: a camera module having an imaging unit configured to capture an image of an imaging field in a predetermined exposure operation period and, after an end of the exposure operation period, sequentially output an imaging signal representing each captured frame image together with imaging operation timing information thereof, a light source configured to illuminate the imaging field, and a light source controller configured to control turn-on and -off of the light source in accordance with a light source control signal generated on a basis of the imaging operation timing information; an imaging device main body having an image signal processor configured to generate a video image from the imaging signals sequentially outputted from the imaging unit and the imaging operation timing information by sequentially joining the frame images and outputs the video image, and a DC power circuit configured to supply DC power to the camera module; and a coaxial cable configured to connect between the camera module and the imaging device main body, wherein a DC power voltage is applied from the DC power circuit to the coaxial cable to drive each component of the camera module, and the imaging signals and the imaging operation timing information thereof sequentially outputted from the imaging unit are outputted to the image signal processor in a state of being superimposed on the DC power voltage applied to the coaxial cable by a first superimposition circuit of the camera module, and characterised in that the first superimposition circuit superimposes the imaging signals sequentially outputted from the imaging unit and the imaging operation timing information thereof on the DC power voltage applied to the coaxial cable in a voltage stable period after a lapse of a voltage variation period that is set at a predetermined elapsed time from a time of the turn-on or -off control of the light source, wherein the imaging unit relatively delays the time of end of the exposure operation period with respect to the time of the turn-off control of the light source, such that the imaging signals and the imaging operation timing information thereof are outputted in the voltage stable period, which is set after a lapse of the voltage variation period that is set at the predetermined elapsed time from the time of the turn-off control of the light source until the time of the turn-on control of the light source. a camera module having an imaging unit configured to capture an image of an imaging field in a predetermined exposure operation period and, after an end of the exposure operation period, sequentially output an imaging signal representing each captured frame image together with imaging operation timing information thereof, a light source configured to illuminate the imaging field, and a light source controller configured to control turn-on and -off of the light source in accordance with a light source control signal generated on a basis of the imaging operation timing information; an imaging device main body having an image signal processor configured to generate a video image from the imaging signals sequentially outputted from the imaging unit and the imaging operation timing information by sequentially joining the frame images and outputs the video image, and a DC power circuit configured to supply DC power to the camera module; and a coaxial cable configured to connect between the camera module and the imaging device main body, wherein a DC power voltage is applied from the DC power circuit to the coaxial cable to drive each component of the camera module, and the imaging signals and the imaging operation timing information thereof sequentially outputted from the imaging unit are outputted to the image signal processor in a state of being superimposed on the DC power voltage applied to the coaxial cable by a first superimposition circuit of the camera module, and characterised in that the first superimposition circuit superimposes the imaging signals sequentially outputted from the imaging unit and the imaging operation timing information thereof on the DC power voltage applied to the coaxial cable in a voltage stable period after a lapse of a voltage variation period that is set at a predetermined elapsed time from a time of the turn-on or -off control of the light source,