Abstract: A case for a cellular phone in which an elastic member having corrugated protrusions is attached to inner side of the case. The corrugated protrusions are formed on one or both inner sides of the case facing each other. The corrugated protrusions are formed vertically or horizontally with respect to a direction in which the cellular phone is inserted. Thus, an external impact is absorbed. Also, the cellular phone does not easily slip out without an additional locking apparatus so that a possibility of losing is low. Further, when the surface of the cellular phone is contaminated, the surface of the cellular phone is cleaned by simple actions of inserting and taking out the cellular phone with respect to the case.