A terminal connector with an electric wire includes a bottom portion, a wall, a plurality of connection pieces, and an auxiliary wall. An end portion of the electric wire is placed on and connected to the bottom portion. The electric wire includes a core wire exposed at the end portion. The wall is provided continuously from the bottom portion and integrally rises from one side of the bottom portion extending to another side. One of the connection pieces extends from one end of the bottom portion and another one of the connection pieces extends from one end of the wall and the connection pieces are contacted and connected to an opposing terminal connector. The auxiliary wall is provided continuously from another end of the wall that is opposite from the one end from which the connection piece extends. The auxiliary wall extends downwardly to the bottom portion.