An optical fiber including a circuit board, a converter, an optical fiber, an external connecting part, and a pressable part. The circuit board includes first and second faces opposite to each other. The first face has first and second regions being different regions. The second face has third and fourth regions on the opposite side to the first and second regions, respectively. The converter is an opto-electronic or electro-optic converter on the first region of the circuit board. The optical fiber includes a leading end portion optically connected to the converter. A circuit on the first region of the circuit board is electrically connected to the converter. The external connecting part is disposed on the fourth region of the circuit board. The pressable part is fixed to the circuit board and positioned on the second region of the circuit board without contacting the converter, the optical fiber, or the circuit.