Abstract: Polyethylene powder satisfying (Requirements 1 and 2): (Requirement 1) a viscosity change rate of a gel under <Conditions for Preparing Gel> is ?0.8 to 0.0 Pas/° C. under <Conditions for Measurement of Viscosity Change Rate>; <Conditions for Preparing Gel> 28 g liquid paraffin of 450 to less than 550 g/mol, 12 g polyethylene powder, and 0.4 g tetrakis[methylene(3,5-di-t-butyl-4-hydroxy-hydrocinnamate)]methane are kneaded at 200° C. and 50 rpm for 10 min using Labo Plastomill to obtain a gel; <Conditions for Measurement of Viscosity Change Rate> viscosity (Pas) is measured at a piston rate of 10 mm/min (shear rate of 266 s?1) at 200° C. and 230° C. in accordance with a flow characteristics test using a capillary die prescribed in JIS K7199, and a viscosity change rate (Pas/° C.