In a holding portion of a contact fitting, in a state before crimping of core wires, the thickness of a first distal end portion and the thickness of a second distal end portion are both 70% or less of the thickness of the bottom portion. The thicknesses are both smaller than the diameter of core wires of a lead wire to be crimped. The first distal end portion and the second distal end portion are formed by compression processing. Using the holding portion, a first side portion and a second side portion are curved such that they face the bottom portion, and the plurality of core wires are surrounded and crimped with the bottom portion, the first side portion, and the second side portion.