An input assisting apparatus that is detachable from an electronic apparatus including a touch sensor panel including a plurality of first input areas assigned with input information includes: a main body having a first surface and a second surface, the first surface facing the touch sensor panel when the input assisting apparatus is attached to the electronic apparatus, the second surface being on an opposite side of the first surface; one or more elastically-deformable bulge portions that respectively correspond to one or more first input areas of the plurality of first input areas of the touch sensor panel and are provided to bulge from the second surface of the main body; and opening portions that are provided to the one or more bulge portions and expose at least a part of the one or more first input areas corresponding to the one or more bulge portions.