Hinge structure having coupling structure of arm part and rotation part and electronic device including the same

An electronic device comprising:

• a first housing;
• a second housing;
• at least one hinge structure connecting the first housing and the second housing;
• and
• a display, at least a portion of which is disposed on the first housing, the second housing, and the at least one hinge structure,
• wherein the hinge structure includes:
• a first rotation part connected to the first housing and being rotatable about a first axis;
• a second rotation part connected to the second housing and being rotatable about a second axis in an opposite direction to that of the first rotation part;
• a first arm part connected to the first rotation part and being rotatable about a first rotary shaft;
• a second arm part connected to the second rotation part and being rotatable about a second rotary shaft in an opposite direction to that of the first arm part;
• a first fixing pin connecting the first rotation part and the first arm part;
• and
• a second fixing pin connecting the second rotation part and the second arm part,
• wherein the first rotation part includes:
• a first bracket body;
• and
• a first sliding part formed on one side of the first bracket body, and including a first slide hole, into which a portion of the first fixing pin is insertable,
• wherein the first arm part includes:
• a first basic body;
• and
• a first connection part formed on one side of the first basic body, and
• wherein the first connection part includes:
• a first connection hole, into which a portion of the first fixing pin is insertable;
• and
• a first protrusion formed in a periphery of the first connection hole such that at least a portion thereof is located in the first slide hole to contact the first sliding part,
• wherein the first protrusion is configured to surround the periphery of the first connection hole.