A phase shifter, comprising: a housing having a first surface and a second surface; a first shifting unit configured to be disposed on the first surface of the housing, and to comprise: a first fixed board formed with a first circuit pattern, and a first moving board formed with a first conductive strip that is coupled to the first circuit pattern of the first fixed unit; a second shifting unit configured to be disposed on the second surface of the housing, and to comprise: a second fixed board formed with a second circuit pattern, and a second moving board formed with a second conductive strip that is coupled to the second circuit pattern of the second fixed unit; and a guide unit configured to guide movement of the first moving board of the first shifting unit and/or the second moving board of the second shifting unit, characterised in that the guide unit comprises: at least one side wall guide formed on a side wall of the housing; at least one recessed groove formed on a side surface of the first fixed board and/or the second fixed board; and at least one guide roller configured to guide the first moving board and/or the second moving board. a housing having a first surface and a second surface; a first shifting unit configured to be disposed on the first surface of the housing, and to comprise: a first fixed board formed with a first circuit pattern, and a first moving board formed with a first conductive strip that is coupled to the first circuit pattern of the first fixed unit; a second shifting unit configured to be disposed on the second surface of the housing, and to comprise: a second fixed board formed with a second circuit pattern, and a second moving board formed with a second conductive strip that is coupled to the second circuit pattern of the second fixed unit; and a first fixed board formed with a first circuit pattern, and a first moving board formed with a first conductive strip that is coupled to the first circuit pattern of the first fixed unit; a second shifting unit configured to be disposed on the second surface of the housing, and to comprise: a second fixed board formed with a second circuit pattern, and a second moving board formed with a second conductive strip that is coupled to the second circuit pattern of the second fixed unit; and a second fixed board formed with a second circuit pattern, and a second moving board formed with a second conductive strip that is coupled to the second circuit pattern of the second fixed unit; and a guide unit configured to guide movement of the first moving board of the first shifting unit and/or the second moving board of the second shifting unit, characterised in that the guide unit comprises: at least one side wall guide formed on a side wall of the housing; at least one recessed groove formed on a side surface of the first fixed board and/or the second fixed board; and at least one guide roller configured to guide the first moving board and/or the second moving board. at least one side wall guide formed on a side wall of the housing; at least one recessed groove formed on a side surface of the first fixed board and/or the second fixed board; and at least one guide roller configured to guide the first moving board and/or the second moving board.