Abstract: A detection device adapted to verify or determine a welding quality includes a housing, a moving assembly, a mounting bracket, and a rotating assembly. The moving assembly is movably installed on the housing and is adapted to be moved up and down in a vertical direction. The mounting bracket is fixed to the housing. The rotating assembly includes a rotating member rotatably connected to the mounting bracket and movably connected to the moving assembly, and a contact probe fixed to the rotating member. The contact probe is adapted to make sliding contact with a second component welded on a first component and to push the moving assembly to move in the vertical direction through the rotating member.