CAP AND CAPPED CONTAINER

To provide a cap and a capped container that prevent content tampering and allow for easy unplugging.SOLUTION: A cap 20 comprises a top portion 21, an inner cylindrical portion 22 that extends from the top portion 21, an outer cylindrical portion 23 that is positioned radially outside of the inner cylindrical portion 22, a band portion 30 that is provided between the inner cylindrical portion 22 and the outer cylindrical portion 23, and a plurality of ribs 40 that mutually couple the inner cylindrical portion 22, the band portion 30 and the outer cylindrical portion 23 together. The band portion 30 has a cut portion 31 made smaller in thickness than its surrounding portion, a protrusion portion 32 projecting radially inward and a deformation portion 33 made smaller in thickness than its surrounding portion. Between the ribs 40, the deformation portion 33, the protrusion portion 32 and the cut portion 31 are arranged in this order along the unplugging direction of the cap 20.SELECTED DRAWING: Figure 5 【課題】内容物の改ざん防止を図るとともに、容易に開栓することが可能な、キャップ及びキャップ付き容器を提供する。【解決手段】キャップ２０は、天部２１と、天部２１から延びる内筒部２２と、内筒部２２の径方向外側に位置する外筒部２３と、内筒部２２と外筒部２３との間に設けられたバンド部３０と、内筒部２２、バンド部３０及び外筒部２３を互いに連結する複数のリブ４０とを備えている。バンド部３０は、周囲の部分よりも薄肉化された切断部３１と、径方向内側に突出する突出部３２と、周囲の部分よりも薄肉化された変形部３３とを有している。リブ４０同士の間において、変形部３３、突出部３２及び切断部３１は、キャップ２０の開栓方向に沿って、この順に配置されている。【選択図】図５