To provide a substrate which is used for an adhesive tape, generates no poisonous gas such as chlorine gas, is scarcely tacky, and has the same flexibility as that of polyvinyl chloride tape.

This substrate for the adhesive tape comprises at least one of layers each comprising a propylene polymer [I] satisfying conditions comprising (1) a mesopentad fraction (mmmm) of 0.2 to 0.6 and (2) a racemi-pentad fraction (rrrr)/(1-mmmm) of ≤0.1, and the substrate for the adhesive tape has at least one of layers each comprising 1 to 99 wt.% of the propylene polymer [I] and 99 to 1 wt.% of an olefinic polymer [II].