BACKGROUND According to World Health Organization (WHO) emphasis, medical universities should adapt education, research, and service activities to prioritise health needs and challenges of society. To meet education, research, and service responsibilities to society, medical universities should subject themselves to measurement and assessment. Design, development and validation of a measurement instrument for Iranian Medical Schools' social accountability education function is the aim of study. This instrument is designed and developed to measure quality of education related activities within the accreditation of Iranian medical universities. METHODS This is a psychometric study, to develop the first draft of systematized instrument. Comprehensive literature review of resources, university sites, pre-existing scales, and valid universal metrics were used to extract initial items (questions) and to provide the theoretical support for the initial item pool. The theoretical analysis of the first draft would be done by assessing the face and content validity of the new instrument during the two rounds of Delphi technique for instrument validation. RESULTS Eighty-two items included nine dimensions and were developed and validated after two rounds using the Delphi method. Nine dimensions include: Anticipation of Society's Health Needs on the mission and goals of the program (6 items), planning and managing university activities (12 items), educational research (6 items), curriculum planning and educational programs (27 items), faculty members / staff (5 items), participation in health services (9 items), graduates (7 items), accreditation (7 items), admission of entries (3 items). The overall content validity index of the instrument based on the content experts that makes consensus, S-CVI of relevancy was equal to 0.93. CONCLUSIONS Present paper demonstrates new instrument for education function quality judgment of medical universities. To foster the accreditation standards and norms that reflect social accountability is an urgent need. Therefore, educational institutions and universities should be measured and rewarded based on their real status to meet the important health care needs of society.