A composition for forming a film, the composition comprising: a first water-soluble cellulose ether having a viscosity at 20°C of from 2.5 to 4.5 mPa·s, as determined in a 2% by mass aqueous solution; a second water-soluble cellulose ether having a viscosity at 20°C of from 6.0 to 50.0 mPa·s, as determined in a 2% by mass aqueous solution; a third water-soluble cellulose ether having a viscosity at 20°C of from 4.5 to 15.0 mPa·s, as determined in a 2% by mass aqueous solution; and a solvent; wherein the first water-soluble cellulose ether is selected from four members: two members in Group I: hydroxypropyl methyl cellulose Ia having a degree of substitution of methoxy groups of from 1.10 to 1.60 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.33, and hydroxypropyl methyl cellulose Ib having a degree of substitution of methoxy groups of from 1.80 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.20 to 0.34, and two members both in Group II: hydroxypropyl methyl cellulose IIa having a degree of substitution of methoxy groups of from 1.70 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.18, and methyl cellulose lib having a degree of substitution of methoxy groups of from 1.60 to 2.00, wherein the second water-soluble cellulose ether is the same member as that of the first water-soluble cellulose ether, provided that DS and, if present, MS of the second water-soluble cellulose ether may be the same as or different from the DS and, if present, MS of the first water-soluble cellulose ether, wherein the third water-soluble cellulose ether is selected from members in a Group different from the Group of the first water-soluble cellulose ether, wherein a content of the first water-soluble cellulose ether in the composition is from 3.0 to 15.0% by mass, a content of the second water-soluble cellulose ether in the composition is from 0.5 to 7.0% by mass, and a content of the third water-soluble cellulose ether in the composition is from 4.0 to 18.0% by mass, and wherein the viscosity at 20°C of the 2% by mass aqueous solution of each of the first, second and third water-soluble cellulose ethers is determined using the Ubbelohde type viscometer in accordance with the viscosity measurement by capillary tube viscometer of the General Tests in the Japanese Pharmacopoeia Seventeenth Edition. a first water-soluble cellulose ether having a viscosity at 20°C of from 2.5 to 4.5 mPa·s, as determined in a 2% by mass aqueous solution; a second water-soluble cellulose ether having a viscosity at 20°C of from 6.0 to 50.0 mPa·s, as determined in a 2% by mass aqueous solution; a third water-soluble cellulose ether having a viscosity at 20°C of from 4.5 to 15.0 mPa·s, as determined in a 2% by mass aqueous solution; and a solvent; two members in Group I: hydroxypropyl methyl cellulose Ia having a degree of substitution of methoxy groups of from 1.10 to 1.60 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.33, and hydroxypropyl methyl cellulose Ib having a degree of substitution of methoxy groups of from 1.80 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.20 to 0.34, and hydroxypropyl methyl cellulose Ia having a degree of substitution of methoxy groups of from 1.10 to 1.60 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.33, and hydroxypropyl methyl cellulose Ib having a degree of substitution of methoxy groups of from 1.80 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.20 to 0.34, and two members both in Group II: hydroxypropyl methyl cellulose IIa having a degree of substitution of methoxy groups of from 1.70 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.18, and methyl cellulose lib having a degree of substitution of methoxy groups of from 1.60 to 2.00, hydroxypropyl methyl cellulose IIa having a degree of substitution of methoxy groups of from 1.70 to 2.00 and a molar substitution of hydroxypropoxy groups of from 0.10 to 0.18, and methyl cellulose lib having a degree of substitution of methoxy groups of from 1.60 to 2.00, wherein the second water-soluble cellulose ether is the same member as that of the first water-soluble cellulose ether, provided that DS and, if present, MS of the second water-soluble cellulose ether may be the same as or different from the DS and, if present, MS of the first water-soluble cellulose ether, wherein the third water-soluble cellulose ether is selected from members in a Group different from the Group of the first water-soluble cellulose ether, wherein a content of the first water-soluble cellulose ether in the composition is from 3.0 to 15.0% by mass, a content of the second water-soluble cellulose ether in the composition is from 0.5 to 7.0% by mass, and a content of the third water-soluble cellulose ether in the composition is from 4.0 to 18.0% by mass, and wherein the viscosity at 20°C of the 2% by mass aqueous solution of each of the first, second and third water-soluble cellulose ethers is determined using the Ubbelohde type viscometer in accordance with the viscosity measurement by capillary tube viscometer of the General Tests in the Japanese Pharmacopoeia Seventeenth Edition.