A portable communication device comprising: a housing including a first housing and a second housing; a flexible display disposed in the housing such that a first display portion and a second display portion of the flexible display are disposed over the first housing and the second housing, respectively; and a hinge structure coupled to the first housing and the second housing, the hinge structure including: a first arm configured to rotate about a first axis; a second arm configured to rotate about a second axis; a fixed bracket including a first curved guide groove and a second curved guide groove formed on a same surface of the fixed bracket; a first rotary bracket including a first curved rail (211_3) and coupled with the fixed bracket such that the first rotary bracket is configured to rotate about a third axis by the first curved rail (211_3) sliding along the first curved guide groove as the first arm rotates about the first axis; and a second rotary bracket including a second curved rail (212_3) and coupled with the fixed bracket such that the second rotary bracket is configured to rotate about a fourth axis different from the third axis by the second curved rail (212_3) sliding along the second curved guide groove as the second arm rotates about the second axis; wherein at least part of a third display portion of the flexible display between the first display portion and the second display portion is configured to be bent as the first rotary bracket rotates about the third axis and the second rotary bracket rotates about the fourth axis. a housing including a first housing and a second housing; a flexible display disposed in the housing such that a first display portion and a second display portion of the flexible display are disposed over the first housing and the second housing, respectively; and a hinge structure coupled to the first housing and the second housing, the hinge structure including: a first arm configured to rotate about a first axis; a second arm configured to rotate about a second axis; a fixed bracket including a first curved guide groove and a second curved guide groove formed on a same surface of the fixed bracket; a first rotary bracket including a first curved rail (211_3) and coupled with the fixed bracket such that the first rotary bracket is configured to rotate about a third axis by the first curved rail (211_3) sliding along the first curved guide groove as the first arm rotates about the first axis; and a second rotary bracket including a second curved rail (212_3) and coupled with the fixed bracket such that the second rotary bracket is configured to rotate about a fourth axis different from the third axis by the second curved rail (212_3) sliding along the second curved guide groove as the second arm rotates about the second axis; wherein at least part of a third display portion of the flexible display between the first display portion and the second display portion is configured to be bent as the first rotary bracket rotates about the third axis and the second rotary bracket rotates about the fourth axis. a first arm configured to rotate about a first axis; a second arm configured to rotate about a second axis; a fixed bracket including a first curved guide groove and a second curved guide groove formed on a same surface of the fixed bracket; a first rotary bracket including a first curved rail (211_3) and coupled with the fixed bracket such that the first rotary bracket is configured to rotate about a third axis by the first curved rail (211_3) sliding along the first curved guide groove as the first arm rotates about the first axis; and a second rotary bracket including a second curved rail (212_3) and coupled with the fixed bracket such that the second rotary bracket is configured to rotate about a fourth axis different from the third axis by the second curved rail (212_3) sliding along the second curved guide groove as the second arm rotates about the second axis; wherein at least part of a third display portion of the flexible display between the first display portion and the second display portion is configured to be bent as the first rotary bracket rotates about the third axis and the second rotary bracket rotates about the fourth axis.