Fiber connection structure provided with optical connector, module, and assembly

An optical connector-equipped fiber connection structure comprising a first multi-core connector, a second multi-core connector, and a plurality of optical fibers configured to connect the first multi-core connector to the second multi-core connector, wherein

• the plurality of optical fibers has at least three groups including two or more of the optical fibers adjacent to each other in the first multi-core connector,
• in the groups, two or more of the optical fibers extend from the first multi-core connector to the second multi-core connector without intersecting with each other,
• the optical fibers of the two groups in the at least three groups intersect with each other in a midway point going from the first multi-core connector to the second multi-core connector, and
• the optical fibers of the group other than the two groups extend from the first multi-core connector to the second multi-core connector without intersecting with other optical fibers extending from the first multi-core connector.