To provide an ethylenic polymer composition having excellent flexibility, heat resistance and high-frequency welder processability and a tarpaulin using the same.

This ethylenic polymer composition comprises (A) a straight- chain ethylene-α-olefin copolymer composed of ethylene and a 3-18C α-olefin and having 10-80°C temperature of the maximum peak in an elution curve obtained by temperature rising elution fractionation and 0.1-100 g/10 min melt flow rate, (B) an ethylene vinyl acetate copolymer having 0.05-100 g/10 min melt flow rate, (C) a modified ethylenic polymer with a functional group- containing ethylenically unsaturated compound and (D) a hydrous inorganic compound. The ratio of the component (A) accounts for ≥10 wt.% of the total amount of the components (A) and (B) and the content of the vinyl acetate units derived from the component (B) is 4-30 wt.%. The melt flow rate as the polymer composition is 0.1-80 g/10 min. The tarpaulin is obtained by laminating a layer of the ethylenic polymer composition onto at least one surface of a fiber knitted or woven fabric as a base fabric.