A terahertz antenna module for generating or detecting a terahertz wave, comprising: a container having a recess and an opening formed on the bottom surface of the recess; a buffer member disposed in the recess so as to surround the opening while being in contact with the inner surface of the recess; a hemispherical lens which is disposed in the recess while a spherical surface portion is in contact with the buffer member, and transmits a terahertz wave; a wiring board which includes a substrate for allowing light of a predetermined wavelength to pass through and an electrode for transmitting electric signals, and is disposed in the recess; a photoconductive antenna element which is fixed to the wiring board so that light having a predetermined wavelength is irradiated onto a photoconductive antenna part while being in contact with a flat portion of the hemispherical lens, and electrically connected to the electrode of the wiring board; and a cover which is attached to the container and presses the wiring board, the photoconductive antenna element, and the hemispherical lens against the buffer member; wherein the wiring board is positioned by the recess and the hemispherical lens is positioned by the buffer member so that the optical axis of the hemispherical lens passes through the photoconductive antenna part; characterised in that an electric signal input/output port is attached to the container and has an electric signal input/output pin electrically connected to the electrode of the wiring board; and wherein the cover presses the wiring board against the electric input/output pin of the electric input/output port. a container having a recess and an opening formed on the bottom surface of the recess; a buffer member disposed in the recess so as to surround the opening while being in contact with the inner surface of the recess; a hemispherical lens which is disposed in the recess while a spherical surface portion is in contact with the buffer member, and transmits a terahertz wave; a wiring board which includes a substrate for allowing light of a predetermined wavelength to pass through and an electrode for transmitting electric signals, and is disposed in the recess; a photoconductive antenna element which is fixed to the wiring board so that light having a predetermined wavelength is irradiated onto a photoconductive antenna part while being in contact with a flat portion of the hemispherical lens, and electrically connected to the electrode of the wiring board; and a cover which is attached to the container and presses the wiring board, the photoconductive antenna element, and the hemispherical lens against the buffer member; wherein the wiring board is positioned by the recess and the hemispherical lens is positioned by the buffer member so that the optical axis of the hemispherical lens passes through the photoconductive antenna part; characterised in that an electric signal input/output port is attached to the container and has an electric signal input/output pin electrically connected to the electrode of the wiring board; and wherein the cover presses the wiring board against the electric input/output pin of the electric input/output port.