Connector connection structure

A connector connection structure that connects a first connector provided for one of a supply source and a reservoir of liquid hydrogen and a second connector provided for the other of the supply source and the reservoir, wherein:

• the first connector includes
• a main body,
• a first connecting surface that is fixed to the main body and abuts a second connecting surface of the second connector,
• a rotating ring that surrounds the first connecting surface and is rotatable with respect to the first connecting surface, and
• a restricting pin that prohibits a rotation of the rotating ring with respect to the first connecting surface;
• when the rotating ring takes a predetermined rotational phase with respect to the second connector, the rotating ring is able to pull in the second connector in an axial direction to an abutting position at which the second connecting surface abuts the first connecting surface, and further, rotates with respect to the first connecting surface in a state where the second connector is pulled in to the abutting position and partially engages with the second connector so as to maintain a connection state;
• and
• when the second connector is pulled in to the abutting position, the restricting pin moves from a restricting position at which the rotation of the rotating ring is prohibited to an allowable position at which the rotation of the rotating ring is allowed.