To provide a solution applicator with which irritation on an affected part of a patient may be reduced even when a solution is used.According to the present invention, an applicator comprises a solution container which comprises an opening, and a columnar brush member formed by bundling synthetic fibers in a columnar shape. The columnar brush member is disposed at the opening of the solution container, a tip portion of the columnar brush member at an outside of the solution container has a fan shape expanding in a perpendicular lateral direction against a pillar axial lengthwise direction, and a thickness of the fan-shaped tip portion of the columnar brush member decreases in a perpendicular lengthwise direction against the pillar axial lengthwise direction toward the tip portion of the columnar brush member. The solution applicator of the present invention has the fan-shaped tip portion so that irritation on an affected part may be decreased and a liquid tinea unguium medicine may be applied to the affected part.