An electrode inspection apparatus for spot welding comprising: measuring reference plates, each having an electrode fixing hole for inserting and fixing a tip of an electrode for spot welding; and a camera module, wherein the camera module includes a mirror configured to reflect a tip surface of the electrode, a module body including first and second frames (40a, 40b) located at both ends of the mirror, a camera located at each side of the mirror between the first and second frames (40a, 40b), and configured to capture the tip surface of the electrode reflected by the mirror, a control device connected to the cameras and configured to process the image of the tip surface of the electrode and compare the result with a predetermined value to determine whether the tip surface of the electrode is usable, wherein the electrode fixing hole is suitable to have the tip of the electrode fixed and inserted therein, and wherein each of the measuring reference plates is attached to the camera module such that the electrode fixing hole corresponds to the mirror, and the camera being configured to capture the tip surface of the electrode via the mirror, characterized in that the camera module further comprises: a camera holder having a housing recess for housing the camera, and a pair of flexible band-like clips, wherein, in use, the clips are bent and the ends of the both clips engage with the end edges of the first and second frames (40a, 40b) to assemble the camera module, and wherein the first frame, the camera holder, and the second frame are fixed by this engagement, with the first and second frames (40a, 40b) located at both sides of the camera holder with an opening of the housing recess facing outward, the camera being pressed in a middle of the clip by resilient force of each of the clips. measuring reference plates, each having an electrode fixing hole for inserting and fixing a tip of an electrode for spot welding; and a camera module, wherein the camera module includes a mirror configured to reflect a tip surface of the electrode, a module body including first and second frames (40a, 40b) located at both ends of the mirror, a camera located at each side of the mirror between the first and second frames (40a, 40b), and configured to capture the tip surface of the electrode reflected by the mirror, a control device connected to the cameras and configured to process the image of the tip surface of the electrode and compare the result with a predetermined value to determine whether the tip surface of the electrode is usable, wherein the electrode fixing hole is suitable to have the tip of the electrode fixed and inserted therein, and wherein each of the measuring reference plates is attached to the camera module such that the electrode fixing hole corresponds to the mirror, and the camera being configured to capture the tip surface of the electrode via the mirror, characterized in that the camera module further comprises: a camera holder having a housing recess for housing the camera, and a pair of flexible band-like clips, wherein, in use, the clips are bent and the ends of the both clips engage with the end edges of the first and second frames (40a, 40b) to assemble the camera module, and a mirror configured to reflect a tip surface of the electrode, a module body including first and second frames (40a, 40b) located at both ends of the mirror, a camera located at each side of the mirror between the first and second frames (40a, 40b), and configured to capture the tip surface of the electrode reflected by the mirror, a control device connected to the cameras and configured to process the image of the tip surface of the electrode and compare the result with a predetermined value to determine whether the tip surface of the electrode is usable, a camera holder having a housing recess for housing the camera, and a pair of flexible band-like clips, wherein, in use, the clips are bent and the ends of the both clips engage with the end edges of the first and second frames (40a, 40b) to assemble the camera module, and