Optical fiber connecting tool

An optical fiber connecting tool small in size and weight, excellent in portability, simple in structure, manufacturable at a low cost, and easily and surely connecting optical fiber at site, comprising a tool body for spreading an optical fiber holding groove by fitting a wedge piece into the wedge insert slit of a splice member by the operation for holding a pair of right and left holding frames opposed to each other across the splice member and a fiber insert guide (32) installed in the tool body and guiding an optical fiber core onto the generally center axis of the optical fiber holding groove through a core guide groove extending in the center axis Y1 direction of the optical fiber holding groove.