An optical connector device, comprising: a first optical connector including a first housing configured to hold a ferrule provided at a distal end of an optical fiber; and a second optical connector including a light guide member for a fiber optic transceiver (11, 12), and a second housing configured to accommodate the fiber optic transceiver (11, 12) and the light guide member and to which the first housing is fitted, wherein the light guide member includes a plate-like portion, tubular portions, and engagement portions, the pair of tubular portions project from substantially the center of a front surface of the plate-like portion and each include a lens unit having a convex lens function therein the engagement portions are formed to be continuous with both sides of the plate-like portion, and are configured to engage with the fiber optic transceiver (11, 12), the second housing includes a ferrule insertion portion inside the second housing, the ferrule insertion portion includes a ferrule insertion hole, into which the ferrule is insertable, along an insertion direction of the ferrule, the ferrule insertion hole being configured to arrange the ferrule so as to be opposed to the light guide member when the ferrule is inserted into the ferrule insertion hole, the ferrule has a cylindrical outer peripheral surface, the ferrule insertion hole has a cylindrical inner peripheral surface, the cylindrical outer peripheral surface of the ferrule is provided with a ferrule fixing structure configured to fix the ferrule in the ferrule insertion hole and to suppress play of the ferrule in the ferrule insertion hole, and the ferrule fixing structure is provided in a pair, the pair being arranged symmetrically with respect to a line orthogonal to a center axis (X,X2) of the ferrule insertion hole, arranged on one side of the center axis in a direction orthogonal to the center axis and the line, and arranged to press the ferrule directly onto a lower side of the cylindrical inner peripheral surface of the ferrule insertion hole on another side of the center axis. a first optical connector including a first housing configured to hold a ferrule provided at a distal end of an optical fiber; and a second optical connector including a light guide member for a fiber optic transceiver (11, 12), and a second housing configured to accommodate the fiber optic transceiver (11, 12) and the light guide member and to which the first housing is fitted, wherein the light guide member includes a plate-like portion, tubular portions, and engagement portions, the pair of tubular portions project from substantially the center of a front surface of the plate-like portion and each include a lens unit having a convex lens function therein the engagement portions are formed to be continuous with both sides of the plate-like portion, and are configured to engage with the fiber optic transceiver (11, 12), the second housing includes a ferrule insertion portion inside the second housing, the ferrule insertion portion includes a ferrule insertion hole, into which the ferrule is insertable, along an insertion direction of the ferrule, the ferrule insertion hole being configured to arrange the ferrule so as to be opposed to the light guide member when the ferrule is inserted into the ferrule insertion hole, the ferrule has a cylindrical outer peripheral surface, the ferrule insertion hole has a cylindrical inner peripheral surface, the cylindrical outer peripheral surface of the ferrule is provided with a ferrule fixing structure configured to fix the ferrule in the ferrule insertion hole and to suppress play of the ferrule in the ferrule insertion hole, and the ferrule fixing structure is provided in a pair, the pair being arranged symmetrically with respect to a line orthogonal to a center axis (X,X2) of the ferrule insertion hole, arranged on one side of the center axis in a direction orthogonal to the center axis and the line, and arranged to press the ferrule directly onto a lower side of the cylindrical inner peripheral surface of the ferrule insertion hole on another side of the center axis.