PROBLEM TO BE SOLVED: To provide a medical image diagnostic apparatus capable of obtaining a relationship between an action state of a body and an occurrence timing of a biological reaction.SOLUTION: A medical image diagnostic apparatus includes an internal image acquiring unit, an input unit, an outer appearance image acquiring unit, a storage unit, an identification unit, and a control unit. The internal image acquiring unit continuously or intermittently irradiates a predetermined body part of the subject with X-rays to acquire the plurality of internal images different in time phase. The input unit inputs occurrence information indicating the occurrence of the predetermined biological reaction of the subject. The outer appearance image acquiring unit acquires the outer appearance image by photographing the predetermined body part of the subject at least at a photographing timing corresponding to the input of the occurrence informationon the biological reaction. The identification unit identifies the internal image acquired at substantially the same time as inputting of the occurrence information among the plurality of internal images The control unit stores the identified internal image and the outer appearance image acquired at the photographing timing in the storage unit in association with each other.
