This study aimed to validate the French version of the Experiences in Close Relationships–Revised (ECR-R) adult attachment questionnaire by investigating its internal structure and construct validity. The sample (N = 600) consisted of an equal number of male and female participants aged 25–45 years. Variables linked to adult romantic attachment (marital satisfaction, sexual satisfaction and fears associated with sexual activities, and self-esteem) were assessed using a set of questionnaires. The reliability of the two attachment dimensions (viz., avoidance and anxiety) was satisfactory. Confirmatory factor analyses revealed that the original two-factor model explained the data collected with the French ECR-R most satisfactorily. The assessment of measurement invariance showed that the structure is the same across the original U. S. sample and our sample, across men and women, and across single individuals and those in a couple relationship. Our evaluation of construct validity showed that the higher avoidance and anxiety, the lower self-esteem and sexual satisfaction and the higher the fears associated with sexuality. These results are theoretically coherent and consistent with those of previous studies of the English version of the scale. We conclude that the French version is valid.