Reinforcement device for optical fiber fusion splicing section and fusion splicer provided with same

A reinforcement device for an optical fiber fusion-spliced portion, which reinforces a fusion-spliced portion of optical fibers by heating and shrinking a reinforcement sleeve covering the fusion spliced portion, the reinforcement device comprising:

• a heater configured to heat the reinforcement sleeve,
• wherein the heater includes a sleeve housing portion capable of housing the reinforcement sleeve,
• wherein the sleeve housing portion includes at least a first wall portion extending in a longitudinal direction of the sleeve housing portion and a second wall portion facing the first wall portion and extending in the longitudinal direction,
• wherein the first wall portion and the second wall portion are configured such that a distance between the first wall portion and the second wall portion increases from a bottom portion side of the heater toward a top portion side of the heater in a cross-section orthogonal to the longitudinal direction, and
• wherein at least one bent portion is formed to at least one of the first wall portion and the second wall portion in the cross-section.