The present invention relates to an energy delivery device for expanding a tubular organ, the energy delivering device delivering energy to a tubular organ by an optical fiber for treatment and expanding a tissue in the tubular organ, the device comprising a light diffusing optical fiber connected between a laser device and a fixing tip and delivering light; a contraction unit having one end connected to the fixing tip and arranged in a circumference of an end of the light diffusing optical fiber; a movement unit closely adhered to the other end of the contraction unit, in which the light diffusing optical fiber is inserted; and an expansion adjustment unit adjusting a moving distance of the movement unit and expanding the contraction unit in a radial direction while contracting the contraction unit.