An electronic device (100, 200) comprising: a first housing (101, 201); a second housing (102, 202) pivotably connected to the first housing (101, 201); a hinge module (204, 300) configured to pivotably couple the first housing (101, 201) and the second housing (102, 202) to each other; and a flexible display (103, 203) disposed from one surface of the first housing (101, 201) to one surface of the second housing (102, 202) across an area in which the hinge module (204, 300) is disposed, wherein the hinge module (204, 300) comprises: a pair of gear shafts (303a, 303b) engaged with each other to rotate in opposite directions with respect to each other; a first hinge arm and a second hinge arm, each hinge arm (304a, 304b) mounted on a corresponding one of the gear shafts (303a, 303b) to rotate about a rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b); a first mounting member and a second mounting member, each mounting member (305a, 305b) mounted on a corresponding one of the first housing (101, 201) and the second housing (102, 202); and a plurality of slide pins (349a, 349b) coupled to the first hinge arm and slidably coupled to the first mounting member, and/or a plurality of slide pins (349a, 349b) coupled to the second hinge arm and slidably coupled to the second mounting member; and wherein, among the slide pins (349a, 349b), a first pin is located at a first distance from the rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b), and a second pin is located at a second distance different from the first distance from the rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b), and wherein the first pin and the second pin are coupled to the same side of one of the first mounting member or the second mounting member, characterised in that a distance between the first pin and the second pin is set to be greater than a distance by which the first pin or the second pin moves on the mounting member (305a, 305b). a first housing (101, 201); a second housing (102, 202) pivotably connected to the first housing (101, 201); a hinge module (204, 300) configured to pivotably couple the first housing (101, 201) and the second housing (102, 202) to each other; and a flexible display (103, 203) disposed from one surface of the first housing (101, 201) to one surface of the second housing (102, 202) across an area in which the hinge module (204, 300) is disposed, wherein the hinge module (204, 300) comprises: a pair of gear shafts (303a, 303b) engaged with each other to rotate in opposite directions with respect to each other; a first hinge arm and a second hinge arm, each hinge arm (304a, 304b) mounted on a corresponding one of the gear shafts (303a, 303b) to rotate about a rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b); a first mounting member and a second mounting member, each mounting member (305a, 305b) mounted on a corresponding one of the first housing (101, 201) and the second housing (102, 202); and a plurality of slide pins (349a, 349b) coupled to the first hinge arm and slidably coupled to the first mounting member, and/or a plurality of slide pins (349a, 349b) coupled to the second hinge arm and slidably coupled to the second mounting member; and a pair of gear shafts (303a, 303b) engaged with each other to rotate in opposite directions with respect to each other; a first hinge arm and a second hinge arm, each hinge arm (304a, 304b) mounted on a corresponding one of the gear shafts (303a, 303b) to rotate about a rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b); a first mounting member and a second mounting member, each mounting member (305a, 305b) mounted on a corresponding one of the first housing (101, 201) and the second housing (102, 202); and a plurality of slide pins (349a, 349b) coupled to the first hinge arm and slidably coupled to the first mounting member, and/or a plurality of slide pins (349a, 349b) coupled to the second hinge arm and slidably coupled to the second mounting member; and wherein, among the slide pins (349a, 349b), a first pin is located at a first distance from the rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b), and a second pin is located at a second distance different from the first distance from the rotation axis (R1, R2) of the corresponding gear shaft (303a, 303b), and wherein the first pin and the second pin are coupled to the same side of one of the first mounting member or the second mounting member, characterised in that a distance between the first pin and the second pin is set to be greater than a distance by which the first pin or the second pin moves on the mounting member (305a, 305b).