A medical diagnostic imaging apparatus includes: a bed device on which an examinee lies down; a gantry having a tunnel-shaped inner portion into which the bed device moves and inserts a table with which the examinee is in direct contact, and being configured to obtain information on an interior of the examinee by imaging the examinee located in the inner portion; and a control device configured to control drive of the bed device and the gantry. The medical diagnostic imaging apparatus further includes a multi-degree-of-freedom support mechanism mounted at a position facing the bed device with the gantry interposed in between and configured to support the table based on a control by the control device in accordance with movement of the table.