Dielectric　elastomer　sensors　are　a　recent　type　of　mechanical　sensors　utilized　to　detect　forces,　pressures　and　deformations.　The　sensors　have　several　advantages　compared　with　traditional　sensors　including　high　elasticity,　capacitive　sensing　and　inexpensive　fabrication.　In　this　paper,　a　new　sensing　device　for　measuring　small　concentrated　force　is　proposed.　The　device　deploys　the　dielectric　membrane　on　the　surface　of　cantilever　beam　of　constant　strength.　The　dielectric　membrane　is　a　capacitance　sensor　built　with　dielectric　polymer　coated　with　soft　electrodes.　The　change　in　strain　arising　from　the　cantilever　beam　with　concentrated　force　at　free　end　can　be　quickly　transferred　to　the　dielectric　membrane.　The　strain　variation　of　the　dielectric　membrane　induces　the　change　in　the　capacitance　of　the　membrane.　Tests　on　the　device　show　that　the　concentrated　force　at　the　free　end　of　the　cantilever　beam　is　approximately　proportional　to　the　change　in　the　capacitance.　According　to　the　relation,　the　unknown　concentrated　force　can　be　obtained　accurately　by　measuring　the　change　in　the　capacitance　of　the　dielectric　membrane.　The　new　device　is　capable　of　monitoring　small　concentrated　force　with　prominent　sensitivity.