A foldable electronic device (201, 301), comprising: a display (261, 361) comprising a first area (261a, 361a), a second area (261b, 361b), and a flexible area (261c, 361c) between the first area (261a, 361a) and the second area (261b, 361b); a first housing (210, 310) located around the first area (261a, 361a) of the display (261, 361); a second housing (220, 320) located around the second area (261b, 361b) of the display (261, 361); and a hinge assembly (330, 430, 1130) connected between the first housing (210, 310) and the second housing (220, 320) adjacent to at least a portion of the flexible area (261c, 361c) of the display (261, 361) and configured to operate between a folded position at which the first area (261a, 361a) and the second area (261b, 361b) face each other and an unfolded position at which the first area (261a, 361a) and the second area (261b, 361b) do not face each other, wherein the hinge assembly (330, 430, 1130) comprises: a hinge cover (265, 365) connected to the first housing (210, 310) and the second housing (220, 320); a first hinge connected to the hinge cover (265, 365) to support the first area (261a, 361a) of the display (261, 361); and a second hinge connected to the hinge cover (265, 365) to support the second area (261b, 361b) of the display (261, 361), wherein each of the first hinge and the second hinge comprises: a shaft (489, 1189a, 1189b) with a folding axis; a first elastic body configured to apply an elastic force to a first cam (483, 1183a, 1183b); the first cam (483, 1183a, 1183b) configured to perform a linear motion while elastically moving by means of the first elastic body in an axial direction of the folding axis of the shaft (489, 1189a, 1189b) when the first elastic body is stretched or compressed in the axial direction of the folding axis; a second cam (484, 1184a, 1184b) configured to contact the first cam (483, 1183a, 1183b); and a third cam (485, 1185a, 1185b) configured to contact the first cam (483, 1183a, 1183b), and wherein the first cam (483, 1183a, 1183b) is configured to contact only one of the second cam (484, 1184a, 1184b) and the third cam (485, 1185a, 1185b) at a time. a display (261, 361) comprising a first area (261a, 361a), a second area (261b, 361b), and a flexible area (261c, 361c) between the first area (261a, 361a) and the second area (261b, 361b); a first housing (210, 310) located around the first area (261a, 361a) of the display (261, 361); a second housing (220, 320) located around the second area (261b, 361b) of the display (261, 361); and a hinge assembly (330, 430, 1130) connected between the first housing (210, 310) and the second housing (220, 320) adjacent to at least a portion of the flexible area (261c, 361c) of the display (261, 361) and configured to operate between a folded position at which the first area (261a, 361a) and the second area (261b, 361b) face each other and an unfolded position at which the first area (261a, 361a) and the second area (261b, 361b) do not face each other, wherein the hinge assembly (330, 430, 1130) comprises: a hinge cover (265, 365) connected to the first housing (210, 310) and the second housing (220, 320); a first hinge connected to the hinge cover (265, 365) to support the first area (261a, 361a) of the display (261, 361); and a second hinge connected to the hinge cover (265, 365) to support the second area (261b, 361b) of the display (261, 361), a hinge cover (265, 365) connected to the first housing (210, 310) and the second housing (220, 320); a first hinge connected to the hinge cover (265, 365) to support the first area (261a, 361a) of the display (261, 361); and a second hinge connected to the hinge cover (265, 365) to support the second area (261b, 361b) of the display (261, 361), wherein each of the first hinge and the second hinge comprises: a shaft (489, 1189a, 1189b) with a folding axis; a first elastic body configured to apply an elastic force to a first cam (483, 1183a, 1183b); the first cam (483, 1183a, 1183b) configured to perform a linear motion while elastically moving by means of the first elastic body in an axial direction of the folding axis of the shaft (489, 1189a, 1189b) when the first elastic body is stretched or compressed in the axial direction of the folding axis; a second cam (484, 1184a, 1184b) configured to contact the first cam (483, 1183a, 1183b); and a third cam (485, 1185a, 1185b) configured to contact the first cam (483, 1183a, 1183b), and a shaft (489, 1189a, 1189b) with a folding axis; a first elastic body configured to apply an elastic force to a first cam (483, 1183a, 1183b); the first cam (483, 1183a, 1183b) configured to perform a linear motion while elastically moving by means of the first elastic body in an axial direction of the folding axis of the shaft (489, 1189a, 1189b) when the first elastic body is stretched or compressed in the axial direction of the folding axis; a second cam (484, 1184a, 1184b) configured to contact the first cam (483, 1183a, 1183b); and a third cam (485, 1185a, 1185b) configured to contact the first cam (483, 1183a, 1183b), and wherein the first cam (483, 1183a, 1183b) is configured to contact only one of the second cam (484, 1184a, 1184b) and the third cam (485, 1185a, 1185b) at a time.