Dielectric　elastomer　sensors　are　a　new　kind　of　capacitive　sensors.　They　can　be　used　to　measure　forces,　pressures　and　deformations.　The　sensors　have　several　advantages　such　as　high　elasticity　and　inexpensive　fabrication　compared　with　traditional　sensors.　In　this　paper,　a　new　sensing　device　for　measuring　small　concentrated　force　is　proposed.　The　structure　of　the　device　is　a　cantilever　beam　with　constant　strength　on　which　is　fixed　the　dielectric　membrane.　The　dielectric　membrane　is　a　capacitance　sensor　built　with　dielectric　polymer　coated　with　soft　electrodes.　When　the　cantilever　beam　is　subjected　to　a　concentrated　force　at　its　free　end,　the　strain　changed　in　the　cantilever　beam　will　induce　the　change　in　the　capacitance　of　the　membrane.　According　to　the　relation,　the　unknown　concentrated　force　can　be　monitored　by　measuring　the　change　in　the　capacitance.　The　testing　results　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.　The　prototype　demonstrated　the　new　device　is　capable　of　monitoring　small　concentrated　force　with　prominent　sensitivity.　©　(2014)　Trans　Tech　Publications,　Switzerland.