The present invention relates to a heat generating optical fiber and a method of manufacturing the same. The present invention is characterized in that a reflection tube 13 is formed over an entire region corresponding to a side surface of an optical fiber 11 so that a laser beam transmitted through the optical fiber 11 can not escape to the outside, Since the laser beam is continuously reflected by the fixing tube 13 to generate heat, the heat generated by the laser beam is transmitted to the outer circumferential surface of the reflection tube 13 in order to transmit heat to the inside of the blood vessel, The thermal conduction tube 14 is covered to cover the laser beam so that the laser beam is emitted to the side of the optical fiber 11 on the side surface of the optical fiber 11 with respect to the central axis of the optical fiber 11, A plurality of grooves are formed on the side surface of the optical fiber 11 so that the space between the optical fiber 11 and the reflection tube 13 is expanded by the laser beam in the longitudinal direction of the optical fiber 11 with the cover 12 peeled off. In optical fiber The second round groove 11d, the first circular groove 11c, the second reflection groove 11b, the first reflection 11b, the second reflection groove 11b, the second reflection groove 11b, and the second reflection groove 11c are sequentially arranged between the optical fiber end 11e and the cover 12 of the optical fiber 11, The second reflective groove 11b and the first reflective groove 11a are formed in a shape of a conical shape toward the central axis in a direction orthogonal to the longitudinal direction of the optical fiber 11 And the second reflective groove 11b is formed at a position adjacent to the optical fiber end 11e than the first reflective groove 11a and the second reflective groove 11b and the first reflective groove 11a The groove forming position of the conical shape is located opposite to the center axis of the optical fiber 11 a
