The present invention provides a connector assembly allowing attachment of a connector to a connector receptacle with a limited attachment space. The connector assembly includes the connector having a terminal and a connector housing, the connector receptacle having a case and a terminal portion, and a fastening member. The terminal has an electrical contact portion with a hole. The connector housing has a column portion for receiving the electrical contact portion with the hole aligned in an insertion direction of the connector. The terminal portion has a connection portion to be superposed with the electrical contact portion and has a second hole to be communicated with the hole. The case has a housing portion for supporting the connection portion so that the second hole of the connection portion is aligned with the insertion direction of the connector. The electrical contact portion and the connection portion are fastened together with the fastening member passed through the communicated hole and the second hole.