Optical connector and optical connection structure

An optical connector that is configured to be engaged with an adaptor for fiber optical splicing, comprising:

• an optical fiber that includes a glass fiber including a core and a cladding covering the core, and a resin coating portion covering the glass fiber, an end portion of the glass fiber being exposed from the resin coating portion;
• a ferrule that includes a ferrule main body holding the glass fiber exposed from the resin coating portion and a flange portion fixed to the ferrule main body;
• a housing that accommodates the ferrule and includes an inner wall surface facing the ferrule;
• and
• an elastic member that is accommodated in the housing and applies an elastic force to the ferrule in a longitudinal direction of the housing, wherein
• the housing is configured to have a space between the inner wall surface and the flange portion, and
• the housing is configured such that at least a part of the housing including the inner wall surface is deformed in a state where the housing is engaged with the adaptor, and the inner wall surface prevents rotation of the flange portion with respect to the housing.