An optical fiber re-coating device comprising: an optical fiber coater that comprises a pair of upper and lower forming members made of a transparent material and a ultraviolet light emitter provided therein, the lower forming member having a resin injection port to which a liquiform resin is injected, the optical fiber coater curing the injected resin by irradiating the resin with ultraviolet light of the ultraviolet light emitter and thereby coating a coating-removed portion of an optical fiber with the resin; a resin reservoir tank that stores the resin which is before subjected to curing; a tube pump that supplies the resin stored in the resin reservoir tank to an optical fiber coater; and an air bubble separator that separates air bubbles included in the resin from the tube pump therefrom, sends the resin from which the air bubbles are separated to the optical fiber coater, and returns the resin including the separated air bubbles to the resin reservoir tank, wherein the air bubble separator has an upper side surface and a lower side surface, the air bubble separator includes a resin accumulator serving as a space, a resin flow inlet port which is a part of a resin flow-in passage, a resin discharge port, a resin supply port which is a part of a resin supply passage, and a resin collection port which is a part of a resin collection passage, the resin flow inlet port is provided on the upper side surface and is connected to the resin flow-in passage into which the resin flows from the tube pump, the resin supply port is provided on the lower side surface and is connected to the resin supply passage which sends the resin to the optical fiber coater, the space of the resin accumulator is connected to the resin collection passage that is used to return the resin including the separated air bubbles to the resin reservoir tank, and the resin collection passage is located upper than the resin supply passage. an optical fiber coater that comprises a pair of upper and lower forming members made of a transparent material and a ultraviolet light emitter provided therein, the lower forming member having a resin injection port to which a liquiform resin is injected, the optical fiber coater curing the injected resin by irradiating the resin with ultraviolet light of the ultraviolet light emitter and thereby coating a coating-removed portion of an optical fiber with the resin; a resin reservoir tank that stores the resin which is before subjected to curing; a tube pump that supplies the resin stored in the resin reservoir tank to an optical fiber coater; and an air bubble separator that separates air bubbles included in the resin from the tube pump therefrom, sends the resin from which the air bubbles are separated to the optical fiber coater, and returns the resin including the separated air bubbles to the resin reservoir tank, wherein the air bubble separator has an upper side surface and a lower side surface, the air bubble separator includes a resin accumulator serving as a space, a resin flow inlet port which is a part of a resin flow-in passage, a resin discharge port, a resin supply port which is a part of a resin supply passage, and a resin collection port which is a part of a resin collection passage, the resin flow inlet port is provided on the upper side surface and is connected to the resin flow-in passage into which the resin flows from the tube pump, the resin supply port is provided on the lower side surface and is connected to the resin supply passage which sends the resin to the optical fiber coater, the space of the resin accumulator is connected to the resin collection passage that is used to return the resin including the separated air bubbles to the resin reservoir tank, and the resin collection passage is located upper than the resin supply passage.