To provide a tape for underlining which can instantaneously check annoying spots without soiling an important book and the like, and a tape holding tool.

The tape for underlining 20 includes an underlining tape body 21 which is formed on one surface of the tape and becomes an underlining when it is stuck on an object to be stuck, and an adhesive layer 22 which is formed on the other surface and coated with the adhesive material. According to this constitution, a tape for underlining is stuck on a target passage of document and thereby the annoying spots can be instantaneously found. In addition, the tape for underlining can be easily released when it becomes unnecessary, not to soil an important book and the like.