In a method of manufacturing an oxide superconducting wire, a superconducting laminated body is prepared, a tape-shaped stabilizer is folded to be divided into a first portion in which the stabilizer covers one surface of the superconducting laminated body in a thickness direction and a second portion in which the stabilizer covers both side surfaces of the superconducting laminated body in a widthwise direction and the stabilizer is disposed around the superconducting laminated body, the first portion is formed to have a width larger than that of the superconducting laminated body using a molding jig and the superconducting laminated body is covered with the stabilizer, and the superconducting laminated body and the stabilizer are bonded and a bonding material between the second portion and the superconducting laminated body is formed to have a thickness larger than that of a bonding material between the first portion and the superconducting laminated body.