Foldable electronic device including structure for reducing damage of hinge

A multi-foldable electronic device comprising:

• a housing comprising a first housing part, a second housing part, and a third housing part;
• a first hinge assembly rotatably coupling the first housing part and the second housing part;
• a second hinge assembly rotatably coupling the second housing part and the third housing part, the second hinge assembly comprising a sliding member comprising a first sink arm and a second sink arm, the sliding member configured to be slid in accordance with linkage between:
• spiral surfaces of the first sink arm and the second sink arm, and
• rotation of the third housing part and the second housing part with respect to each other;
• and
• a stopper coupled to the sliding member, the stopper configured move in accordance with the rotation of the third housing part with respect to the second housing part,
• wherein the stopper is configured to support the second housing part and the third housing part in an unfolded state of the multi-foldable electronic device by the stopper being between the second housing part and the third housing part.