PROBLEM TO BE SOLVED: To provide a particle-containing composition in which particles are stably dispersed in a liquid. A particle-containing composition includes (A) chemically modified cellulose fibers, (B) particles, and (C) water, and the (A) chemically modified cellulose fibers have a cellulose type I crystal structure. However, a part of the hydroxyl groups of the cellulose is substituted with a substituent represented by the following general formula (1), and the (A) chemically modified cellulose fiber has 0.01 mmol to 3.0 mmol of the above substituent per 1 g of the chemically modified cellulose fiber. The average degree of polymerization of the chemically modified cellulose fiber (A) is 100 to 3000. [Selection diagram] None【課題】粒子を液中に安定的に分散した粒子含有組成物を提供する。【解決手段】粒子含有組成物は、（Ａ）化学修飾セルロース繊維と、（Ｂ）粒子と、（Ｃ）水とを含み、前記（Ａ）化学修飾セルロース繊維は、セルロースI型結晶構造を有し、セルロースの一部の水酸基が下記の一般式（１）で表される置換基によって置換され、前記（Ａ）化学修飾セルロース繊維１ｇあたり０．０１ｍｍｏｌ～３．０ｍｍｏｌの前記置換基を有し、前記（Ａ）化学修飾セルロース繊維の平均重合度は、１００～３０００である、。【選択図】なし
