An electronic apparatus includes a replaceable device, an apparatus casing, a supporting structure, an abutting structure, and a removable carrier. The supporting structure, the abutting structure, and the removable carrier function as an installation mechanism for installing the replaceable device into the apparatus casing. The supporting structure and the abutting structure are disposed in the apparatus casing. The abutting structure has two side walls oppositely disposed. The removable carrier includes a fixing frame and an actuation part pivotally connected to the fixing frame. The replaceable device is fixed on the fixing frame. When the removable carrier is disposed on the supporting structure, the actuation part can be rotated relative to the fixing frame and alternatively abut against one side wall so that the fixing frame moves on the supporting structure and a connector of the replaceable device is engaged with or disengaged from a connector of the electronic apparatus respectively.