An antenna module, comprising: a first conductive member connected to a feeding portion and a grounding portion through a grounding line, wherein the first conductive member is shaped to define a slit between the feeding portion and the grounding portion; and a second conductive member positioned within the first conductive member to define a region therebetween; the antenna module further comprises: a first connecting member connecting the first conductive member to the second conductive member; and a second connecting member connecting the first conductive member to the second conductive member, wherein the first connecting member connects the first conductive member to the second conductive member at a first location between the feeding portion and one end of the first conductive member, and wherein the second connecting member connects the first conductive member to the second conductive member at a second location between the grounding portion and the other end of the first conductive member, wherein the first conductive member forms at least three parts of four lateral parts of a terminal body, characterized in that the antenna module further comprises: a sub-arm comprising first and second end portions, wherein the first end portion is connected to the first conductive member, and the second end portion is open, wherein the sub-arm is formed on a rear cover or a rear case of the terminal body, and wherein the first end portion is connected to the first conductive member at a position between the grounding portion and the second connecting member, such that a resonant path is formed from the grounding line to the open end of the sub-arm passing through the first conductive member. a first conductive member connected to a feeding portion and a grounding portion through a grounding line, wherein the first conductive member is shaped to define a slit between the feeding portion and the grounding portion; and a second conductive member positioned within the first conductive member to define a region therebetween; the antenna module further comprises: a first connecting member connecting the first conductive member to the second conductive member; and a second connecting member connecting the first conductive member to the second conductive member, a first connecting member connecting the first conductive member to the second conductive member; and a second connecting member connecting the first conductive member to the second conductive member, wherein the first connecting member connects the first conductive member to the second conductive member at a first location between the feeding portion and one end of the first conductive member, and wherein the second connecting member connects the first conductive member to the second conductive member at a second location between the grounding portion and the other end of the first conductive member, wherein the first conductive member forms at least three parts of four lateral parts of a terminal body, characterized in that the antenna module further comprises: a sub-arm comprising first and second end portions, wherein the first end portion is connected to the first conductive member, and the second end portion is open, wherein the sub-arm is formed on a rear cover or a rear case of the terminal body, and wherein the first end portion is connected to the first conductive member at a position between the grounding portion and the second connecting member, such that a resonant path is formed from the grounding line to the open end of the sub-arm passing through the first conductive member. a sub-arm comprising first and second end portions, wherein the first end portion is connected to the first conductive member, and the second end portion is open, wherein the sub-arm is formed on a rear cover or a rear case of the terminal body, and wherein the first end portion is connected to the first conductive member at a position between the grounding portion and the second connecting member, such that a resonant path is formed from the grounding line to the open end of the sub-arm passing through the first conductive member.