DETENTION DEVICE

To provide a detention device capable of suitably suppressing peeling of a patch member from the body surface and of stably detaining a body on the body surface of a living body.SOLUTION: A detention device 10 (a medicine administration device 12) includes a body 14 and a body side sticking sheet 60. The body side sticking sheet 60 has: a first portion 63 fixing a rear surface 22 to the body 14; a second portion 64 capable of floating the body 14 at a position adjacent to the first portion 63; and a peripheral portion 65 which protrudes outside the first portion 63 and the second portion 64 and is stuck onto the body surface. In a lateral extension part 66 of the peripheral portion 65, width Wex of a boundary adjacent part 66c overlapping an extension line EX at a boundary X between the first portion 63 and the second portion 64 is wider than width W2 of a second portion adjacent part 66b positioned nearer on the side of the second portion 64 than the extension line EX.SELECTED DRAWING: Figure 3 【課題】体表からの貼付部材の剥がれを良好に抑制して、生体の体表に本体を安定的に留置することができる留置デバイスを提供する。【解決手段】留置デバイス１０（薬剤投与装置１２）は、本体１４と、本体側貼付シート６０とを備える。本体側貼付シート６０は、本体１４の裏面２２を固定する第１部位６３と、第１部位６３に隣接する位置で本体１４を浮上可能とする第２部位６４と、第１部位６３及び第２部位６４よりも外側に突出して体表に貼り付けられる周辺部位６５と、を有する。周辺部位６５の側方延在部６６は、第１部位６３と第２部位６４の境界Ｘの延長線ＥＸに重なる境界隣接部６６ｃの幅Ｗｅｘが、延長線ＥＸよりも第２部位６４側に位置する第２部位隣接部６６ｂの幅Ｗ２よりも広い。【選択図】図３