PROBLEM TO BE SOLVED: To provide a stylet device which enables only a needle part of a stylet to easily remain in the skin and which can prevent the remaining needle part from easily coming off the skin.SOLUTION: A stylet device includes a stylet 3 that has a base plate 11 and a needle part 13 protruding from one surface 11a of the base plate 11, and a film 5 that is arranged on the side of one surface 11a of the base plate 11. The film 5 includes a solvent capable of dissolving the needle part 13. The thickness of the film 5 is smaller in dimension than the height H of the needle part 13 from the one surface 11a.【課題】針状体の針部のみが容易に皮膚内に残留し、かつ残留した針部が容易に皮膚より脱離しないようにすることが可能な針状体デバイスを提供する。【解決手段】基板１１と、基板１１の一方の面１１ａから突起した針部１３とを有する針状体３と、基板１１の一方の面１１ａ側に配置されるフィルム５とを備える。フィルム５が、針部１３を溶解可能な溶媒を含む。かつ、フィルム５の厚さが、針部１３の一方の面１１ａからの高さＨよりも小さい。【選択図】図１
