An electronic device is provided, which includes a first housing; a second housing; a hinge housing; a hinge assembly; first and second hinge plates covering at least part of the hinge assembly; an FPCB; and a flexible display. The hinge assembly includes a support portion having a plurality of support grooves and at least part of the first and second hinge plates may be supported by the support grooves in an unfolded state of the electronic device.