Provided is a crimp terminal including an electric wire connector connectable to an electric wire. The electric wire connector includes a body, a plurality of first crimping pieces extending from a first end of the body, and at least one second crimping piece extending from a second end thereof. The first and second crimping pieces are alternately arranged while being displaced from each other. When the crimping pieces are crimped to connect a core wire of the electric wire, a clearance between one first crimping piece and the second crimping piece formed at a position closest to an insulating member of the electric wire is larger than a clearance between a remaining first crimping piece and the second crimping piece formed at another position. Also provided are an electric wire with the crimp terminal, and a medical device sensor including the electric wire with the crimp terminal.