PROBLEM TO BE SOLVED: To provide a fat emulsion containing a poorly soluble medicament which is water-insoluble and oil-insoluble, the fat emulsion having an enhanced rate of including a medicament in an emulsion particle.SOLUTION: A fat emulsion at least contains a medicament, a fat and oil, water, and a phospholipid. The fat emulsion is characterized in that the medicament is a non-steroidal anti-inflammatory agent having a solubility in water of 1×10mg/mL or less and a solubility in soybean oil of 10 mg/mL or less and containing a carboxyl group in the chemical structural formula the pH of the fat emulsion is 3 to 6 and the rate of including the medicament in the emulsion particle is 80% or more.