The polyolefin [A] has a weight average molecular chain length of 2850 nm or longer and a density 1 (g/cm³), the polyolefin wax [B] has a weight average molecular weight of 700-6000 and a density 2 (g/cm³), the polyolefin and the polyolefin wax are incorporated at [A]/[B]=90/10-50/50 (ratio by weight), and the densities 1 and 2 satisfy the following conditions: 0.9210.94, 0.9120.93, -0.03(1-2)0.03.