An imaging device comprising: an image sensor that photoelectrically converts subject light to generate image signals; a storage portion comprising a second area within a first area, the first area being configured to store an image to be displayed on an entire screen and the second area being configured to store a partial image to be displayed in a portion of the screen which corresponds to a specific area specified by a setting value for setting an extracting range of an image based on the image signals; a timing adjustment unit that adjusts the timing at which the image signals are read from the image sensor and the image signals are written to the storage portion and the timing at which the image signals are read from the storage portion; an image conversion processor that performs predetermined processing on the image based on the image signals read from the image sensor so that writing of the image signals to each of the first and second areas occurs every two frames, the image conversion processor writing a one-directional image signal corresponding to an image obtained by imaging in one direction, among the image signals input from the image sensor, to the second area in a first frame period, writing a left-directional image signal corresponding to an image obtained by imaging the left side of the one direction to a first split area split from the first area in a second frame period subsequent to the first frame period, and writing a right-directional image signal corresponding to an image obtained by imaging the right side of the one direction to a second split area split from the first area in the second frame period; an output unit that converts the one-directional image signal, the left-directional image signal, and the right-directional image signal read from the first and second areas in accordance with continuous scanning timing into image signals of a predetermined format and outputs the image signals to a display unit, and an image quality adjustment unit that controls the driving of the image sensor and adjusts the image quality of images based on the one-directional image signal, the left-directional image signal, and the right-directional image signal written to the first and second areas in synchronization with the timing at which the image signals are taken from the image sensor in units of frames so that the one-directional image signal is adjusted differently from the left-directional image signal and the right-directional image signal. an image sensor that photoelectrically converts subject light to generate image signals; a storage portion comprising a second area within a first area, the first area being configured to store an image to be displayed on an entire screen and the second area being configured to store a partial image to be displayed in a portion of the screen which corresponds to a specific area specified by a setting value for setting an extracting range of an image based on the image signals; a timing adjustment unit that adjusts the timing at which the image signals are read from the image sensor and the image signals are written to the storage portion and the timing at which the image signals are read from the storage portion; an image conversion processor that performs predetermined processing on the image based on the image signals read from the image sensor so that writing of the image signals to each of the first and second areas occurs every two frames, the image conversion processor writing a one-directional image signal corresponding to an image obtained by imaging in one direction, among the image signals input from the image sensor, to the second area in a first frame period, writing a left-directional image signal corresponding to an image obtained by imaging the left side of the one direction to a first split area split from the first area in a second frame period subsequent to the first frame period, and writing a right-directional image signal corresponding to an image obtained by imaging the right side of the one direction to a second split area split from the first area in the second frame period; an output unit that converts the one-directional image signal, the left-directional image signal, and the right-directional image signal read from the first and second areas in accordance with continuous scanning timing into image signals of a predetermined format and outputs the image signals to a display unit, and an image quality adjustment unit that controls the driving of the image sensor and adjusts the image quality of images based on the one-directional image signal, the left-directional image signal, and the right-directional image signal written to the first and second areas in synchronization with the timing at which the image signals are taken from the image sensor in units of frames so that the one-directional image signal is adjusted differently from the left-directional image signal and the right-directional image signal.