Electric wire with terminal and manufacturing method of electric wire with terminal

A method for manufacturing an electric wire with a terminal, comprising:

• a crimping step of crimping an electric wire connection portion of a crimping terminal by interposing the electric wire connection portion and an electric wire between a first metal mold and a second metal mold including a concave portion and by winding the electric wire connection portion around a core and a cover of the electric wire, wherein
• in the crimping step, the electric wire connection portion is crimped with respect to the electric wire by the second metal mold including a diameter expansion portion in an end portion of the concave portion on a tip end side of the core, and a plane portion in which the diameter expansion portion faces the first metal mold,
• the electric wire connection portion includes a bottom wall portion, and a pair of swaging pieces respectively protruding from both ends of the bottom wall portion in a width direction,
• the pair of swaging pieces include a first swaging piece wound around the core and the cover, and a second swaging piece wound around an outside of the first swaging piece in a superposed manner,
• a tip end of the first swaging piece is separated from the bottom wall portion in the diameter expansion portion,
• the diameter expansion portion includes a flat portion which faces the bottom wall portion in a height direction of the crimping terminal, and of which an outside surface is parallel to the bottom wall portion in the width direction,
• the outside surface of the flat portion is parallel to the electric wire in an axis direction,
• the diameter expansion portion includes a side wall portion extending towards the flat portion from the bottom wall portion in the height direction, and a curved corner portion joining the flat portion and the side wall portion together,
• in the electric wire connection portion, the bottom wall portion of the portion crimped with respect to the core includes a recess portion which is recessed towards the core side, and
• the diameter expansion portion is separated from the recess portion in the axis direction of the electric wire.