a variable - length applicator which can extend and retract an applicator element by simple operation and does not require a separate cap . the invention comprises an inner housing , a power transmission part mounted in the inner housing , a first outer housing combined slidably on an outer circumference of an upper portion of the inner housing , a head part having a head fixed to an upper end of the first outer housing and a linear moving means fixed to a lower end of the head , the linear moving means being engaged with the power transmission part , a second outer housing fixed to outer circumference of lower portion of the inner housing , and a moving part mounted movably in the second outer housing , the moving part having a linear moving means engaged with the power transmission part opposite to the linear moving means of the head part and an applicator element fixed to the lower end of the linear moving means . with such an arrangement , a downward movement of the head part results in an upward movement of the applicator element .