A pharmaceutical composition comprising: fulvestrant; an aqueous solvent; and a pharmaceutically acceptable nonaqueous carrier, wherein a content of the fulvestrant is 8% by mass to 14% by mass with respect to the entire mass of the pharmaceutical composition, the aqueous solvent satisfies the following requirements to, and the pharmaceutically acceptable nonaqueous carrier is castor oil, or a mixture of castor oil and vegetable oil which is different from castor oil, and satisfies the following requirements and: ethanol is contained in an amount of equal to or greater than 8% by mass with respect to the entire mass of the pharmaceutical composition, at least one kind of polyhydric alcohol selected from propylene glycol or 1,3-butylene glycol is contained in an amount of equal to or greater than 3% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl alcohol is less than 5% by mass with respect to the entire mass of the pharmaceutical composition, a content of the aqueous solvent is 15% by mass to 50% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl benzoate is less than 1% by mass with respect to the entire mass of the pharmaceutical composition, a content of the pharmaceutically acceptable nonaqueous carrier is 40% by mass to 75% by mass with respect to the entire mass of the pharmaceutical composition. fulvestrant; an aqueous solvent; and a pharmaceutically acceptable nonaqueous carrier, wherein a content of the fulvestrant is 8% by mass to 14% by mass with respect to the entire mass of the pharmaceutical composition, the aqueous solvent satisfies the following requirements to, and the pharmaceutically acceptable nonaqueous carrier is castor oil, or a mixture of castor oil and vegetable oil which is different from castor oil, and satisfies the following requirements and: ethanol is contained in an amount of equal to or greater than 8% by mass with respect to the entire mass of the pharmaceutical composition, at least one kind of polyhydric alcohol selected from propylene glycol or 1,3-butylene glycol is contained in an amount of equal to or greater than 3% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl alcohol is less than 5% by mass with respect to the entire mass of the pharmaceutical composition, a content of the aqueous solvent is 15% by mass to 50% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl benzoate is less than 1% by mass with respect to the entire mass of the pharmaceutical composition, a content of the pharmaceutically acceptable nonaqueous carrier is 40% by mass to 75% by mass with respect to the entire mass of the pharmaceutical composition. ethanol is contained in an amount of equal to or greater than 8% by mass with respect to the entire mass of the pharmaceutical composition, at least one kind of polyhydric alcohol selected from propylene glycol or 1,3-butylene glycol is contained in an amount of equal to or greater than 3% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl alcohol is less than 5% by mass with respect to the entire mass of the pharmaceutical composition, a content of the aqueous solvent is 15% by mass to 50% by mass with respect to the entire mass of the pharmaceutical composition, a content of benzyl benzoate is less than 1% by mass with respect to the entire mass of the pharmaceutical composition, a content of the pharmaceutically acceptable nonaqueous carrier is 40% by mass to 75% by mass with respect to the entire mass of the pharmaceutical composition. a content of benzyl benzoate is less than 1% by mass with respect to the entire mass of the pharmaceutical composition, a content of the pharmaceutically acceptable nonaqueous carrier is 40% by mass to 75% by mass with respect to the entire mass of the pharmaceutical composition.