Endoscope hood and endoscope system

An endoscope hood attached to an endoscope insertion section including an optical fiber that optically guides therapeutic light with which biological tissue is to be irradiated and outputs the therapeutic light from a distal end, and also including an observation optical system for observing the biological tissue, the endoscope hood comprising:

• an attachment section attached to a distal end of the endoscope insertion section;
• a pressing section comprising a pressing surface that presses against the biological tissue, the therapeutic light output from the optical fiber being transmittable through the pressing section;
• a light transmission section disposed forward of the observation optical system, light being transmittable through the light transmission section toward the observation optical system;
• and
• an internal light blocking member disposed between a position where the distal end of the optical fiber is disposed and the light transmission section, the therapeutic light output from the distal end of the optical fiber being prevented from entering the light transmission section by the internal light blocking member.