A hinge structure for rotatably connecting a first housing and a second housing of an electronic device , the hinge structure comprising: a first auxiliary hinge part (301-1) adapted to be connected to the first housing ; a second auxiliary hinge part (301-2) adapted to be connected to the second housing; the hinge structure being configured to rotatably connect the first auxiliary hinge part (301-1) and the second auxiliary hinge part (301-2), wherein the hinge structure comprises: an idle gear , a first gear configured to engage with the idle gear in a first direction with respect to the idle gear , a second gear configured to engage with the idle gear in a second direction opposite to the first direction with respect to the idle gear , a first body disposed in the first direction with respect to the idle gear , integrally formed with the first gear to rotate with respect to the idle gear according to a rotation of the first gear , and slidably connected to the first auxiliary hinge part (301-1), and a second body disposed in the second direction with respect to the idle gear , integrally formed with the second gear to rotate with respect to the idle gear according to a rotation of the second gear , and slidably connected to the second auxiliary hinge part (301-2). a first auxiliary hinge part (301-1) adapted to be connected to the first housing ; a second auxiliary hinge part (301-2) adapted to be connected to the second housing; the hinge structure being configured to rotatably connect the first auxiliary hinge part (301-1) and the second auxiliary hinge part (301-2), wherein the hinge structure comprises: an idle gear , a first gear configured to engage with the idle gear in a first direction with respect to the idle gear , a second gear configured to engage with the idle gear in a second direction opposite to the first direction with respect to the idle gear , a first body disposed in the first direction with respect to the idle gear , integrally formed with the first gear to rotate with respect to the idle gear according to a rotation of the first gear , and slidably connected to the first auxiliary hinge part (301-1), and a second body disposed in the second direction with respect to the idle gear , integrally formed with the second gear to rotate with respect to the idle gear according to a rotation of the second gear , and slidably connected to the second auxiliary hinge part (301-2). an idle gear , a first gear configured to engage with the idle gear in a first direction with respect to the idle gear , a second gear configured to engage with the idle gear in a second direction opposite to the first direction with respect to the idle gear , a first body disposed in the first direction with respect to the idle gear , integrally formed with the first gear to rotate with respect to the idle gear according to a rotation of the first gear , and slidably connected to the first auxiliary hinge part (301-1), and a second body disposed in the second direction with respect to the idle gear , integrally formed with the second gear to rotate with respect to the idle gear according to a rotation of the second gear , and slidably connected to the second auxiliary hinge part (301-2). <EOS>