A portable electronic apparatus includes a portable electronic device and a data access device installed on the portable electronic apparatus. The data access device includes a main body, a rotary arm and a sliding arm. The rotary arm is pivoted to the main body. When the rotary arm rotates to a folding position relative to the main body, the rotary arm is contained inside the main body. When the rotary arm rotates to a fixing position relative to the main body, the rotary arm protrudes out of the main body. The sliding arm is slidably disposed on the rotary arm so as to adjust a relative position between the sliding arm and the rotary arm. The sliding arm fixes the portable electronic device with the main body as the rotary arm rotates to the fixing position relative to the main body.