Abstract: An improved slip casing for a mobile phone made of elastomer, it is comprised of a casing and a fixing clip, the fixing clip is provided at a suitable location on the casing. By providing an elastic clamping portion on the casing, the mobile phone is clamped in the casing; and by providing the fixing clip, the casing with the mobile phone can be engaged on a belt at any suitable position on one's body. Thereby, an effect of convenient carrying is achieved.