Cellulose acetate, cellulose acetate composition, molded article, and film

A cellulose acetate having an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less,

• wherein the cellulose acetate has a ratio of a molar content of glucose to a sum of molar contents of glucose, xylose and mannose is 98.0% or more in sugar composition analysis,
• when the acetone-insoluble substance content is measured by steps of:
• dissolving cellulose acetate in acetone at a solid concentration of 3 wt % to obtain a solution;
• filtering the solution by suction filtration at room temperature of 25° C. under a reduced pressure of 30 mmHg using a glass filter having a pore diameter of 5 to 10 μm to obtain filtration residue;
• washing a dope adhering to the filtration residue with acetone;
• drying the filtration residue and the glass filter,
• wherein the glass filter is weighed before and after filtering,
• wherein the acetone-insoluble substance content is calculated as:
• acetone-insoluble substance content (wt %)=[weight of glass filter after filtration (g)−weight of filter before filtration (g)]/weight of cellulose acetate (g)×100.