To provide an optical connection structure, not fully occupying a large space on a board, easily positioning the end of an optical transmission medium, and freely performing connection and disconnection.

In a printed board where a light emitting element and a light receiving element are mounted with the optical axis directed vertically to the board, a support where the light transmission medium is disposed is fixed apart from the board through the board and a support fixing member, and the end of the light transmission medium is positioned toward the light emitting element and the light receiving element, respectively, by a positioning member.