Because of his desire to eternity the problem of death is very important for human. Mulla Sadra transcendent philosophy founder, with the approval of previous philosopher’s definition of death, believes that death is the separation of the soul from the physical body and divides it to natural and sudden. This paper explains the nature of death and its variants and causes of death in view of Mulla Sadra and shows some of its Quranic roots. Also, we present criticisms about Mulla Sadra's division of death; some of which include lack of philosophical criterion for the existence of sudden death and there is no boundary between natural death and sudden death.
