Religion is an inseparable part of human life and it plays a key role in promotion of health. The present study aimed to construct and validate a measure for Religion Practice According to Islamic Believes; RPAIB. The studied sample consisted of 375 undergraduate students from Shahid Bahonar University at Kerman who were selected using stratified random sampling. Data were collected using the religious beliefs questionnaire. Factor analysis of RPAIB revealed support for construct validity of RPAIB in a three factors solution whereby CCRB, CRO, SRRMR were extracted as using PCA method and Varimax rotation. The RPAIB– was satisfactory in terms of psychometrical aspects including construct validity and internal consistency. Due to the perceived lack of instruments with satisfactory psychometrical properties, RPAIB can be used as a valid and reliable inventory to measure the religion believes.