Abstract: The present invention relates to not only the provision of a composition containing a wide variety of particles with good dispersibility, the composition being able to make both rigidity and elongation at sufficient levels compatible with each other even under a low humidity, etc. but also the provision of a coating and a film each formed of the foregoing composition, and a base material having the foregoing coating or film. Specifically, the present invention provides a composition containing an ethylene-vinyl alcohol copolymer (A) having the content of an ethylene unit of 0.5 to 19 mol % relative to all structural units and a particle (B), wherein the content of the particle (B) is 1 part by mass or more and less than 100 parts by mass based on 100 parts by mass of the ethylene-vinyl alcohol copolymer (A).