An optical connection box includes, a plurality of first optical connectors to which a plurality of first optical paths are respectively connected, a plurality of second optical connectors that respectively include an operation unit protruding from a peripheral edge side position further from a position of the plurality of first optical connectors on a first surface of the optical connection box, and that are respectively connected to a plurality of receptacle optical connectors which are disposed in the plurality of second optical paths, a plurality of relay optical fibers in which any one of the plurality of first optical connectors is disposed in the first terminal and any one of the plurality of second optical connectors is disposed in the second terminal, and a fitting structure with respect to a substrate in which the receptacle optical connectors are disposed.