A connector device includes an electrical connector that connects to a receptacle connector, an electric cable connected to the electrical connector, and a lock member attached to the electrical connector. The lock member has a main body portion to sandwich the electrical connector in a fitted state between the receptacle connector and the main body portion, and a lock engagement portion to engage with a connector engagement portion provided in the receptacle connector. The lock engagement portion has a hanging portion, a folded portion, and an extending portion.