A sheet-shaped application member includes: a first region, and a second region extending around the first region, wherein: the first region comprises a first region attachment surface to which a medical device is attachable, and a first region application surface opposite the first region attachment surface and adapted to be applied to a subject, the second region comprises a second region application surface adapted to be applied to the subject, and the first and second application regions are adapted such that, when the application member is applied to the subject, adhesion at the second region application surface is stronger than adhesion at the first region application surface； and an application member tear portion adapted to allow for tearing of a portion within the first region or for tearing the first region from the second region.
