An optical connector comprising: a housing arranged for being provided on a circuit board; an electronic component housed in the housing and having a terminal which is configured to be electrically connected to the circuit board; a shield case covering the housing and arranged for being fixed to the circuit board; and a shield cover covering at least a gap of the shield case and arranged for being fixed to the circuit board, wherein a photoelectric conversion module as the electronic component is housed in the housing, wherein a plate spring portion configured to press and urge the photoelectric conversion module and hold the photoelectric conversion module in the housing is formed on the shield case, and the shield cover is mounted so as to cover at least a region of the shield case where the plate spring portion is formed, and characterized in that the shield cover is formed into a box shape and includes a top plate, side plates formed on both sides of the top plate, and a rear plate formed on a rear side of the top plate, and wherein the shield cover includes first and second extension portions (74, 75) extending along a surface of the circuit board, the first extension portion extending rearward from a lower edge of the rear plate so that a first gap for terminal contact prevention between the surface of the circuit board and the lower edge of the rear plate of the shield case is covered by the first extension portion of the shield cover, with the second extension portions being formed on both side portions of the shield cover to extend laterally from the lower edges of side plates of the shield cover, a second gap between the circuit board and the lower edge of the side plate portion of the shield case being covered by the second extension portions, the shield case is formed into a box shape and includes a top plate portion, side plate portions formed on both sides of the top plate portion, and a rear plate portion formed on a rear side of the top plate portion, and the shield cover is configured to be fixed to the circuit board such that the top plate portion, the side plate portions and the rear plate portion in the shield case are covered by the top plate, the side plates and the rear plate in the shield cover, respectively. a housing arranged for being provided on a circuit board; an electronic component housed in the housing and having a terminal which is configured to be electrically connected to the circuit board; a shield case covering the housing and arranged for being fixed to the circuit board; and a shield cover covering at least a gap of the shield case and arranged for being fixed to the circuit board, wherein a photoelectric conversion module as the electronic component is housed in the housing, wherein a plate spring portion configured to press and urge the photoelectric conversion module and hold the photoelectric conversion module in the housing is formed on the shield case, and the shield cover is mounted so as to cover at least a region of the shield case where the plate spring portion is formed, and characterized in that the shield cover is formed into a box shape and includes a top plate, side plates formed on both sides of the top plate, and a rear plate formed on a rear side of the top plate, and wherein the shield cover includes first and second extension portions (74, 75) extending along a surface of the circuit board, the first extension portion extending rearward from a lower edge of the rear plate so that a first gap for terminal contact prevention between the surface of the circuit board and the lower edge of the rear plate of the shield case is covered by the first extension portion of the shield cover, with the second extension portions being formed on both side portions of the shield cover to extend laterally from the lower edges of side plates of the shield cover, a second gap between the circuit board and the lower edge of the side plate portion of the shield case being covered by the second extension portions, the shield case is formed into a box shape and includes a top plate portion, side plate portions formed on both sides of the top plate portion, and a rear plate portion formed on a rear side of the top plate portion, and the shield cover is configured to be fixed to the circuit board such that the top plate portion, the side plate portions and the rear plate portion in the shield case are covered by the top plate, the side plates and the rear plate in the shield cover, respectively.