A sensor retaining assembly is provided to prevent changes in orientations of the sensors. The sensor retainer assembly comprises: a bumper reinforcement extending laterally in the vehicle; a frame member of a chassis; a rigid member integrated with the frame member; and a connection member on which sensors are installed while being adjacent to each other. One end of the connection member is fixed to the bumper reinforcement, and the other end of the connection member is fixed to the frame member or the rigid member.