Disclosed is an electronic device including a housing having a first plate, a second plate facing in a direction opposite to the first plate, and a side surface member surrounding a space between the first plate and the second plate and including a conductive portion, a communication module, and an antenna structure electrically connected with the communication module, wherein the antenna structure includes at least one first antenna element formed in the conductive portion and including a first slot having a first portion extending in a first length in a first direction and a second portion extending in a second length in a second direction different from the first direction, and at least one second antenna element formed in a position spaced apart by a predetermined distance from the first antenna element in the conductive portion and including at least one second slot having a fourth portion extending in the first length in the first direction and a fifth portion extending in the second length in a third direction different from the second direction.