An antenna device comprising: an antenna module; a radio remote head RRH configured to receive signals from the antenna module and a base station; an attachment/detachment member (120, 130) configured to attach/detach the RRH to/from one surface of the antenna module; connection modules (150, 250) provided on a surface on which the antenna module and the RRH face each other to electrically connect the RRH and the antenna module to each other; and coupling modules (140, 240) provided on one surface of the RRH to move the connection modules (150, 250) so that the connection modules (150, 250) are coupled to or separated from each other wherein the attachment/detachment member (120, 130) is provided on upper and lower portions of the antenna module and the RRH as guide modules (120, 130) configured to slidably guide the RRH on the antenna module, to cause one end portion of the RRH to be rotatably seated, and to cause the other end portion of the RRH to be seated to be movable toward the antenna module, wherein the guide module (120, 130) comprises: an upper end rail portion provided on an upper portion of the antenna module and coupled to one end portion of the RRH to form a circular hollow portion in a sliding direction so as to slidably move and rotatably support the upper end rail portion of the RRH; an upper end slider provided on an upper portion of the RRH, formed in a bar shape in the sliding movement direction, and seated on the upper end rail portion to slidably move along the first guide module (120, 130) or to be rotated on the first guide module (120, 130); a lower end rail portion provided on a lower portion of the antenna module, and coupled to the other end portion of the RRH to slidably move the other end portion of the RRH and to movably support the RRH in a direction in which the RRH gets adjacent to or goes away from the antenna module about the one end portion of the RRH as a rotation axis; and a lower end slider provided on a lower portion of the RRH, and seated on a second guide portion to slidably move along the second guide portion or to move in a vertical direction to a sliding movement direction. an antenna module; a radio remote head RRH configured to receive signals from the antenna module and a base station; an attachment/detachment member (120, 130) configured to attach/detach the RRH to/from one surface of the antenna module; connection modules (150, 250) provided on a surface on which the antenna module and the RRH face each other to electrically connect the RRH and the antenna module to each other; and coupling modules (140, 240) provided on one surface of the RRH to move the connection modules (150, 250) so that the connection modules (150, 250) are coupled to or separated from each other wherein the attachment/detachment member (120, 130) is provided on upper and lower portions of the antenna module and the RRH as guide modules (120, 130) configured to slidably guide the RRH on the antenna module, to cause one end portion of the RRH to be rotatably seated, and to cause the other end portion of the RRH to be seated to be movable toward the antenna module, wherein the guide module (120, 130) comprises: an upper end rail portion provided on an upper portion of the antenna module and coupled to one end portion of the RRH to form a circular hollow portion in a sliding direction so as to slidably move and rotatably support the upper end rail portion of the RRH; an upper end slider provided on an upper portion of the RRH, formed in a bar shape in the sliding movement direction, and seated on the upper end rail portion to slidably move along the first guide module (120, 130) or to be rotated on the first guide module (120, 130); a lower end rail portion provided on a lower portion of the antenna module, and coupled to the other end portion of the RRH to slidably move the other end portion of the RRH and to movably support the RRH in a direction in which the RRH gets adjacent to or goes away from the antenna module about the one end portion of the RRH as a rotation axis; and a lower end slider provided on a lower portion of the RRH, and seated on a second guide portion to slidably move along the second guide portion or to move in a vertical direction to a sliding movement direction. an upper end rail portion provided on an upper portion of the antenna module and coupled to one end portion of the RRH to form a circular hollow portion in a sliding direction so as to slidably move and rotatably support the upper end rail portion of the RRH; an upper end slider provided on an upper portion of the RRH, formed in a bar shape in the sliding movement direction, and seated on the upper end rail portion to slidably move along the first guide module (120, 130) or to be rotated on the first guide module (120, 130); a lower end rail portion provided on a lower portion of the antenna module, and coupled to the other end portion of the RRH to slidably move the other end portion of the RRH and to movably support the RRH in a direction in which the RRH gets adjacent to or goes away from the antenna module about the one end portion of the RRH as a rotation axis; and a lower end slider provided on a lower portion of the RRH, and seated on a second guide portion to slidably move along the second guide portion or to move in a vertical direction to a sliding movement direction.