Ferrule, optical connector, and optical connector module

A ferrule configured to hold an optical transmission member, the ferrule comprising:

• a holding part configured to hold one end portion of the optical transmission member;
• a first surface configured to allow light emitted from the optical transmission member held by the holding part to enter the ferrule;
• and
• a second surface configured to emit, to outside of the ferrule, light advanced inside of the ferrule,
• wherein the holding part including:
• a holding recess,
• a first groove disposed at the holding recess along an extending direction of the optical transmission member, the first groove being a groove where the optical transmission member is disposed,
• a pressing member configured to press the optical transmission member toward the first groove, and
• a sliding part disposed at the holding recess and the pressing member, and configured to slide the pressing member with respect to the holding recess along the extending direction of the optical transmission member.