An electronic device comprising: a first housing including a first space and including a first support member; a second housing including a second space, including a second support member, and slidably combined with the first housing along a first direction; a bendable member connected to the first housing, being at least partly accommodated in the second space in a slide-in state, and at least partly forming a same plane with the first housing in a slide-out state; a flexible display including a first part disposed to be seen from an outside in the slide-in state, and a second part extending from the first part and being at least partly accommodated in the second space in the slide-in state, wherein at least a portion of the second part is supported by the bendable member; at least one first antenna (R, 311-314, 331-333) disposed in the first housing; and a wireless communication circuit disposed in the first space and configured to transmit or receive a wireless signal in at least one frequency band through the at least one first antenna, wherein the first support member includes a non-overlapping part not overlapping the second support member regardless of the slide-in state or the slide-out state and an overlapping part overlapping the second support member in the slide-in state and at least partly formed as a non-conductive area, and wherein the at least one first antenna is disposed in a position overlapping the non-conductive area corresponding to the non-overlapping part when viewed from above the first support member. a first housing including a first space and including a first support member; a second housing including a second space, including a second support member, and slidably combined with the first housing along a first direction; a bendable member connected to the first housing, being at least partly accommodated in the second space in a slide-in state, and at least partly forming a same plane with the first housing in a slide-out state; a flexible display including a first part disposed to be seen from an outside in the slide-in state, and a second part extending from the first part and being at least partly accommodated in the second space in the slide-in state, wherein at least a portion of the second part is supported by the bendable member; at least one first antenna (R, 311-314, 331-333) disposed in the first housing; and a wireless communication circuit disposed in the first space and configured to transmit or receive a wireless signal in at least one frequency band through the at least one first antenna, wherein the first support member includes a non-overlapping part not overlapping the second support member regardless of the slide-in state or the slide-out state and an overlapping part overlapping the second support member in the slide-in state and at least partly formed as a non-conductive area, and wherein the at least one first antenna is disposed in a position overlapping the non-conductive area corresponding to the non-overlapping part when viewed from above the first support member. wherein the first support member includes a non-overlapping part not overlapping the second support member regardless of the slide-in state or the slide-out state and an overlapping part overlapping the second support member in the slide-in state and at least partly formed as a non-conductive area, and wherein the at least one first antenna is disposed in a position overlapping the non-conductive area corresponding to the non-overlapping part when viewed from above the first support member.