Switch mechanism for activating different switches and portable electronic device therewith

A portable electronic device, comprising:

• a casing whereon an opening is formed;
• a first switch component installed inside the casing;
• an expansion module disposed in a position corresponding to the opening;
• a second switch component installed inside the casing, and the second switch component being for activating the expansion module;
• and
• a switch mechanism for activating the first switch component and the second switch component, and the switch mechanism comprising:
• a button for moving in a first direction or a second direction;
• a pressing component connected to a bottom side of the button, and the pressing component being for pressing the first switch component when the button moves in the first direction;
• a linking component, an end of the linking component being connected to the button, and the linking component being driven by the button in the second direction as the button moves in the second direction;
• and
• an activating component detachably contacted with the linking component, and the activating component being driven by the linking component when the linking component moves to an activating position in the second direction, so as to activate the second switch component in a third direction.