Provided is an antenna connector assembly which eliminates adverse effects to a window glass when being fitted on a manufacture line, and is easily and surely attached and removed even in a small space. The antenna connector assembly for connecting an antenna element and a cable is composed of a plug section (10) and a socket section (20). A cable (11) is connected to the plug section (10). The antenna element is connected to the socket section (20), and the plug section (10) fits in the socket section. The socket section (20) has an inserting port (201) from which the plug section (10) can be inserted by being slid in the longitudinal direction of the socket section (20). The plug section (10) has an inclined surface (101) on a portion which abuts to the socket section (20) when the plug section is started to be inserted into the inserting port (201) in a diagonal direction.