A plurality of questions may be obtained for an AMA session. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 m or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 gd or more. The air fin comprises an elongated flange of flexible foam material. For example, a high-frequency item is assigned to the direction corresponding to the vertex, or a range of the direction assigned to the high-frequency item is relatively made larger.