An extrusion die comprising: an opening for supplying a molten resin; a plurality of die hole portions for discharging a strand made of the molten resin; a resin flow path portion extending in a flow path direction (Y) that leads to the plurality of die hole portions from the opening , wherein the resin flow path portion has a resin introduction portion connecting with the opening , and a slit portion located on a downstream side of the resin introduction portion ; and a moving plate movable in an up-and-down direction (Z) so as to protrude toward the resin flow path portion , wherein the moving plate is arranged along a first direction (X) orthogonal to each of the flow path direction (Y) and the up-and-down direction (Z), both end portions of the moving plate in the first direction (X) in an up-and-down direction (Z) so as to contact with an inner wall of the resin flow path portion , and a protrusion amount (t1) of the moving plate with respect to the resin flow path portion decreases from a central portion in the first direction (X) toward the both end portions, and the plurality of die hole portions are coupled to a downstream-side end portion of the slit portion , the first direction (X) is a width direction of the slit portion , and the moving plate is protruding toward the entire width of the slit portion in a middle of the slit portion , a width - (X) of the resin introduction portion gradually increases from an upstream side toward a downstream side, characterized in that a width (X) of the slit portion is larger than a width (X) of the opening , in that the moving plate is protruding toward the slit portion so that a tip surface of the moving plate becomes lower than an upper surface of the slit portion , and in that the tip surface of the moving plate has a shape in which a height position gradually increases from a center point toward both ends in the first direction (X). an opening for supplying a molten resin; a plurality of die hole portions for discharging a strand made of the molten resin; a resin flow path portion extending in a flow path direction (Y) that leads to the plurality of die hole portions from the opening , wherein the resin flow path portion has a resin introduction portion connecting with the opening , and a slit portion located on a downstream side of the resin introduction portion ; and a moving plate movable in an up-and-down direction (Z) so as to protrude toward the resin flow path portion , wherein the moving plate is arranged along a first direction (X) orthogonal to each of the flow path direction (Y) and the up-and-down direction (Z), both end portions of the moving plate in the first direction (X) in an up-and-down direction (Z) so as to contact with an inner wall of the resin flow path portion , and a protrusion amount (t1) of the moving plate with respect to the resin flow path portion decreases from a central portion in the first direction (X) toward the both end portions, and the plurality of die hole portions are coupled to a downstream-side end portion of the slit portion , the first direction (X) is a width direction of the slit portion , and the moving plate is protruding toward the entire width of the slit portion in a middle of the slit portion , a width - (X) of the resin introduction portion gradually increases from an upstream side toward a downstream side, characterized in that a width (X) of the slit portion is larger than a width (X) of the opening , in that the moving plate is protruding toward the slit portion so that a tip surface of the moving plate becomes lower than an upper surface of the slit portion , and in that the tip surface of the moving plate has a shape in which a height position gradually increases from a center point toward both ends in the first direction (X). <EOS>