Background: Research on couples is receiving increased attention. There are some questionnaires assessing relationship quality available in German. However, they are not assessing all relevant dimensions of relationship quality. Therefore, an alternative questionnaire to measure relationship quality (FPQ) is presented in this study. Methods: The measure was tested with a total of 244 adults, who were all in a close relationship at that time. The dimensional structure was tested with exploratory and confirmatory factor analyses. Results: Scale analyses revealed a questionnaire consisting of six subscales (fascination, commitment, sexuality, future of the partnership, mistrust, and constraint autonomy). The internal scale consistencies vary between .78 and .92. Additionally, by using structural equation modeling, a superior factor relationship quality was found. The discriminative validity was confirmed by a group comparison (satisfied and unsatisfied people). Moderate to high correlations with a traditional questionnaire measuring relationship quality and other relevant constructs indicate satisfying convergent validity.