PROBLEM TO BE SOLVED: To provide a sheet in which flaw, fold, etc., are hard to stick in the manner usually assumed, however needle stick holes are left in an exterior appearance emphasized visually when making incorrect usage or incorrect needling such as syringe needles, and thereby the presence of the needle stick history can be decided easily and reliably.SOLUTION: A needle stick detection sheet 100 has a regioselective whitening resin layer 10 having: a whitening area 10a where the circumference of needle stick hole 70 becomes a whitening part 71 at the width being 0.2 mm or more, when the needle stick hole 70 is formed by needling a syringe needle of a blade type R/B of 0.80 mm in diameter； and a non-whitening area 10b where the circumference of the needle stick hole is not whitened or the circumference of the needle stick hole is whitened only at the width less than 0.2 mm, when the needle stick hole is formed by needling the syringe needle of the blade type R/B of 0.80 mm in diameter.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】通常想定される態様では、傷、折り目等が付き難いが、使用方法を誤って、又は不正に注射針等の針が刺された場合に、針刺孔が視覚的に強調された外観で残り、針刺履歴の有無が容易かつ確実に判断できるシートを提供すること。【解決手段】直径０．８０ｍｍ、刃型Ｒ・Ｂの注射針を刺して針刺孔７０を形成したときに、針刺孔７０の周囲が０．２ｍｍ以上の幅で白化部７１となる白化領域１０ａと、直径０．８０ｍｍ、刃型Ｒ・Ｂの注射針を刺して針刺孔を形成したときに、針刺孔の周囲が白化しないか、又は前記針刺孔の周囲が０．２ｍｍ未満の幅でしか白化しない非白化領域１０ｂとを有する位置選択性白化樹脂層１０を有する、針刺検知用シート１００。【選択図】図１
