Provided are an endoscope system and an endoscope capable of performing precise measurement of a temperature of a distal end portion and accurate control of the temperature of optical member, and achieving a reduced diameter of the distal end portion. The endoscope system according to the present invention includes: an optical member positioned at the distal end portion； a heating section 13 that heats the optical member； a first temperature detector 11 configured to detect temperature information of the distal end portion； a second temperature detector 12 connected in parallel with the heating section 13 and configured to detect temperature information of the distal end portion； a control unit 43 configured to control the heating section 13 based on the temperature information of the distal end portion detected by the first temperature detector 11； and an abnormality determination unit 42 configured to determine the presence or absence of abnormality in the first temperature detector 11 and the second temperature detector 12 based on the temperature information of the distal end portion detected by the first temperature detector 11 and the temperature information of the distal end portion detected by the second temperature detector 12.
