An endoscope system comprising: an imaging unit that is able to output, as pixel information, an electric signal that has been photoelectrically converted from multiple target pixels arbitrarily designated as targets to be read from among a plurality of pixels for imaging; a reading unit (34, 36) that is provided on a board mounted with the imaging unit and is configured to read pixel information from the multiple target pixels instructed as the targets to be read in the imaging unit; an imaging-side control unit that is provided on the board and is configured to control a pixel information output process by the imaging unit and a pixel information reading process by the reading unit (34, 36); an image processing unit configured to generate an image from the pixel information read by the reading unit (34, 36); a display unit configured to display the image generated by the image processing unit; a setting unit configured to arbitrarily set the pixels to be read in the imaging unit, wherein the control unit (35, 50) is configured to change the pixels to be read based on the setting by the setting unit; an abnormality determining unit configured to determine whether there is an abnormality in the pixel information read by the reading unit (34, 36) and output, upon determining that there is the abnormality in the pixel information read by the reading unit (34, 36), to the imaging-side control unit, a notification signal for causing the imaging-side control unit to execute control on occurrence of the abnormality; a light irradiating unit configured to irradiate light to an object; and a control unit (35, 55) configured to control, when the abnormality determining unit determines that there is the abnormality in the pixel information read by the reading unit (34, 36), the light irradiating unit to reduce an amount of light irradiated by the light irradiating unit, characterized by a first signal conversion unit configured to convert a signal including the pixel information read by the reading unit (34, 36) from a parallel signal into a serial signal constituted in predetermined bit number units and output the serial signal; a transmitting unit configured to transmit the serial signal output by the first signal conversion unit; and a second signal conversion unit configured to convert the signal including the pixel information transmitted from the transmitting unit from the serial signal into a parallel signal and output the converted signal to the image processing unit, wherein the abnormality determining unit is configured to determine whether there is the abnormality based on whether the serial signal transmitted from the transmitting unit to the second signal conversion unit is constituted in predetermined bit number units. an imaging unit that is able to output, as pixel information, an electric signal that has been photoelectrically converted from multiple target pixels arbitrarily designated as targets to be read from among a plurality of pixels for imaging; a reading unit (34, 36) that is provided on a board mounted with the imaging unit and is configured to read pixel information from the multiple target pixels instructed as the targets to be read in the imaging unit; an imaging-side control unit that is provided on the board and is configured to control a pixel information output process by the imaging unit and a pixel information reading process by the reading unit (34, 36); an image processing unit configured to generate an image from the pixel information read by the reading unit (34, 36); a display unit configured to display the image generated by the image processing unit; a setting unit configured to arbitrarily set the pixels to be read in the imaging unit, wherein the control unit (35, 50) is configured to change the pixels to be read based on the setting by the setting unit; an abnormality determining unit configured to determine whether there is an abnormality in the pixel information read by the reading unit (34, 36) and output, upon determining that there is the abnormality in the pixel information read by the reading unit (34, 36), to the imaging-side control unit, a notification signal for causing the imaging-side control unit to execute control on occurrence of the abnormality; a light irradiating unit configured to irradiate light to an object; and a control unit (35, 55) configured to control, when the abnormality determining unit determines that there is the abnormality in the pixel information read by the reading unit (34, 36), the light irradiating unit to reduce an amount of light irradiated by the light irradiating unit, characterized by a first signal conversion unit configured to convert a signal including the pixel information read by the reading unit (34, 36) from a parallel signal into a serial signal constituted in predetermined bit number units and output the serial signal; a transmitting unit configured to transmit the serial signal output by the first signal conversion unit; and a second signal conversion unit configured to convert the signal including the pixel information transmitted from the transmitting unit from the serial signal into a parallel signal and output the converted signal to the image processing unit, wherein the abnormality determining unit is configured to determine whether there is the abnormality based on whether the serial signal transmitted from the transmitting unit to the second signal conversion unit is constituted in predetermined bit number units.