The social appreciation of cultural heritage is a process where knowledge, values and relationships that people develop around their heritage assets converge. In the absence of validated instruments to measure this construct, this study has focused on designing and validating a "Measurement Scale for the Social Appreciation of Cultural Heritage" (MS-SACH) for high school students. The questionnaire's content has been approved by nine experts and applied to a pilot sample to assess its comprehension. For construct validation, the questionnaire was applied to a sample of 304 students. The confirmatory factor analysis allowed the retention of ten items grouped into three factors associated with the social appreciation of cultural heritage: (1) knowledge about cultural heritage; (2) values attributable to cultural heritage; and (3) heritage linkages. The results allow us to conclude that the scale developed presents evidence of validity and reliability, whose contribution can be of great value in studies for the evaluation of proposals related to the teaching of cultural heritage.