A testing device for a communication device, that is configured to perform characteristic tests in a near field on at least one test target antenna for a microwave band or a milliwave band included in the communication device, the testing device comprising: a housing that forms a test space as an anechoic chamber in a hollow portion; a communication device support unit that supports the communication device in the test space; characterized by a coupler support unit that detachably supports a plurality of coupler antennas receiving radio waves emitted from the test target antenna or transmitting radio waves to the test target antenna, wherein the coupler support unit includes: a plurality of guide rails that linearly extend along one face (S1, S2, S4, S5) of the test space and that support the coupler antennas to be movable back and forth along a longitudinal direction of the extending, and a plurality of housing attachment pieces that each have one portion fixed to the housing and that each include an attachment face supporting an associated one of the guide rails at a predetermined elevation angle on another portion, a length from each of the one portions to the corresponding one of the attachment faces, and an inclination angle of each of the attachment faces are set to cause an antenna beam of a corresponding one of the coupler antennas supported by an associated one of the guide rails to be emitted to the communication device at a predetermined elevation angle, and a plurality of the coupler antennas supported by each of the guide rails respectively set to different elevation angles by each of the associated housing attachment pieces form one coupler antenna group (300A,300B,300C), and the antenna beams from the coupler antennas forming the one coupler antenna group (300A,300B,300C) are caused to focus on the test target antenna that is handled by the coupler antenna group (300A, 300B, 300C) as a test target. a housing that forms a test space as an anechoic chamber in a hollow portion; a communication device support unit that supports the communication device in the test space; characterized by a coupler support unit that detachably supports a plurality of coupler antennas receiving radio waves emitted from the test target antenna or transmitting radio waves to the test target antenna, wherein the coupler support unit includes: a plurality of guide rails that linearly extend along one face (S1, S2, S4, S5) of the test space and that support the coupler antennas to be movable back and forth along a longitudinal direction of the extending, and a plurality of housing attachment pieces that each have one portion fixed to the housing and that each include an attachment face supporting an associated one of the guide rails at a predetermined elevation angle on another portion, a plurality of guide rails that linearly extend along one face (S1, S2, S4, S5) of the test space and that support the coupler antennas to be movable back and forth along a longitudinal direction of the extending, and a plurality of housing attachment pieces that each have one portion fixed to the housing and that each include an attachment face supporting an associated one of the guide rails at a predetermined elevation angle on another portion, a length from each of the one portions to the corresponding one of the attachment faces, and an inclination angle of each of the attachment faces are set to cause an antenna beam of a corresponding one of the coupler antennas supported by an associated one of the guide rails to be emitted to the communication device at a predetermined elevation angle, and a plurality of the coupler antennas supported by each of the guide rails respectively set to different elevation angles by each of the associated housing attachment pieces form one coupler antenna group (300A,300B,300C), and the antenna beams from the coupler antennas forming the one coupler antenna group (300A,300B,300C) are caused to focus on the test target antenna that is handled by the coupler antenna group (300A, 300B, 300C) as a test target.