Female terminal, connector, and wire harness

A female terminal is provided with: a cylindrical section; and a spring piece disposed inside the cylindrical part. The cylindrical part is provided with: an open end into which a male terminal is inserted; and a first inner surface and a second inner surface facing each other with the spring piece interposed therebetween, the first inner surface being a surface for cantilever-supporting the spring piece, the spring piece being provided with: a front-side region facing the male terminal; a back-side region disposed on the first inner surface side; and at least one protrusion provided in the backside region, the protrusion partially protruding toward the first inner surface. 一种阴端子，具备：筒部；以及配置于所述筒部的内部的弹簧片，所述筒部具备：阳端子插入的开口端；以及隔着所述弹簧片而相互对向的第一内表面和第二内表面，所述第一内表面是悬臂支承所述弹簧片的面，所述弹簧片具备：与所述阳端子对向的表侧区域；配置于所述第一内表面侧的背侧区域；以及设置于所述背侧区域的至少一个凸部，所述凸部朝向所述第一内表面局部地突出。