PROBLEM TO BE SOLVED: To provide an oil-in-water type emulsified external preparation composition that prevents separation of moisture from occurring over time and provides excellent emulsion stability even though the viscosity thereof at 25°C is as low as 1,000 mPa.s or less.SOLUTION: According to the present invention, an oil-in-water type emulsified external preparation composition comprises a fermented cellulose and/or cellulose nanofiber and xanthan gum and/or welan gum. Here, the composition satisfies the following conditions (A) and (B): (A) the content of the xanthan gum and/or welan gum to 1 part by mass of the fermented cellulose and/or cellulose nanofiber is 0.1-15 parts by mass (provided that, in the case of using a complex comprising xanthan gam as the fermented cellulose, the content of xanthan gum contained in the complex is excluded)； and (B) a viscosity measured by a B-type rotation viscometer at 30 rpm is 1000 mPa.s or less at 25°C.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】２５℃における粘度が１０００ｍＰａ・ｓ以下と低粘度であるにもかかわらず、経時的に生じる水分の分離が抑制され、乳化安定性に優れる水中油型乳化外用剤組成物の提供。【解決手段】発酵セルロース及び／又はセルロースナノファイバー、並びに、キサンタンガム及び／又はウェランガムを含有し、且つ、以下の条件（Ａ）及び（Ｂ）を満たす、水中油型乳化外用剤組成物。（Ａ）前記発酵セルロース及び／又はセルロースナノファイバー１質量部に対する、前記キサンタンガム及び／又はウェランガムの含量が０．１～１５質量部（但し、前記発酵セルロースとして、キサンタンガを含む複合体を用いる場合は、当該複合体に含まれるキサンタンガム含量を除く）、（Ｂ）２５℃におけるＢ型回転粘度計３０ｒｐｍでの粘度が１０００ｍＰａ・ｓ以下【選択図】なし
