PROBLEM TO BE SOLVED: To provide an effervescent external preparation which produces a large quantity of carbon dioxide bubbles, and also produces long-lasting bubbles, while readily produces carbon dioxide bubbles.SOLUTION: The invention relates to an effervescent external preparation which has (A) an acidic nonaqueous liquid composition, and (B) an aqueous liquid composition containing a basic composition, and is used by mixing the (A) acidic nonaqueous liquid composition and the (B) aqueous liquid composition. Mixing the (A) acidic nonaqueous liquid composition and the (B) aqueous liquid composition at a ratio of 1:5-5:1 to be used is preferable, and the (A) acidic nonaqueous liquid composition is preferred to contain (a1) an acidic anhydrous composition, (a2) polyol, and (a3) a gelling agent or a thickener.
