Abstract-Oxford Happiness Questionnaire (OHQ) is an instrument constructed by Peter Hills and Argyle to measure happiness. OHQ is considered a good instrument, has been translated into several languages and has been used widely in several countries for researchs. The objective of this study is to examine the psychometric properties of the Indonesian version of OHQ. The empirical finding is expected to further validate the Classical Test Theory approach used before. Evaluation of psychometric properties was analyzed using the Item Response Theory (IRT) with Graded Response Model (GRM). A total of 450 people with the age of 18 to 40 have participated in the study. The results have showed that the items in Indonesian version of OHQ have reasonably high discriminating power and are accurate in measuring happiness. As a result, it can be stated that the Indonesian version of OHQ has good psychometric properties and can be used as a reliable measurement tool for evaluating individual happiness in Indonesia for research purpose.

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