Open-and-close structure for cap and charging connector

An open-and-close structure for a cap, comprising:

• a housing containing an electrical connection portion;
• the cap rotatably supported on the housing and configured to, at a closed position, close an opening portion of the housing and, at an open position, expose the electrical connection portion through the opening portion;
• and
• a biasing member configured to apply a biasing force near a rotation shaft of the cap,
• wherein the cap opens and closes while a cap-side sliding contact portion provided on the cap and a biasing member-side sliding contact portion provided on the biasing member make a sliding contact with each other, and
• wherein open position-maintaining means configured to maintain the cap at the open position by a biasing force of the biasing member and reaction force application means configured to apply a reaction force in a closing direction by the biasing member to the cap in response to a further movement of the cap in an open direction from the open position are provided on at least one of the cap-side sliding contact portion or the biasing member-side sliding contact portion.