An endoscope includes: a CMOS image sensor including only a vertical OB pixel region as an optical black pixel region, and a horizontal OB pixel region generation processing section that reads a photoelectric conversion signal generated in an effective pixel region in the CMOS image sensor and an OB signal generated in the vertical OB pixel region, adds the OB signal generated in the vertical OB pixel region to the beginning or end of each row of the photoelectric conversion signal which has been generated in the effective pixel region and read out for each row, and outputs a signal to which the OB signal is added.