Metaphor has been frequently used in the Holy Quran. One of the reasons is undoubtedly  playing an essential function in expressing the intended meanings of the Qur'an. In this respect, translating metaphors of the Qur'an is more sensitive and complicated than it seems at first glance. It is necessary to pay attention to the function of metaphor because neglecting this critical feature when translating the Qur'an will significantly reduce its equal effect on the target language readership. Accordingly, the aim of this study was to prove, in a practical way, this function in translating metaphors of Qur'an into target language. For this purpose,  relying on the descriptive-analytical method and by referring to written sources, types of functions mentioned in  Muslim rhetorician's works for the Qur'an metaphors have been considered, then, we have mentioned the Qur'an textual arrangement as an important factor in determining functions of metaphors. Then, in the central part of the research, Specifically, we have analyzed Verse 29 of Surah Al-Hijr in terms of metaphorical functions as well as in terms of issues related to translative Equivalence, and have compared the efforts of "Khorramshahi," "Fooladvand," "Ayati" and "Meybodi" in their translation of this verse, In terms of metaphorical function. In the end, the result indicates that the reproduction of the intended Qur'anic phrase, through literal translation, reflects the objectification function of the metaphor in its entirety in Persian and Meybodi's mistranslation of the intended phrase is evidence of this fact that he was unaware of its metaphorical function.