The present invention relates to a novel formulation comprising a benzimidazole derivative. The formulation for oral administration comprising a compound of Formula 1 according to the present invention or a pharmaceutically acceptable salt thereof； and at least one disintegrant selected from the group consisting of croscarmellose sodium, sodium starch glycolate and low-substituted hydroxypropylcellulose, exhibits an excellent storage stability and has an effect on preventing a phenomenon of decline in dissolution rate, thus being usefully used as a formulation for oral administration.
