PROBLEM TO BE SOLVED: To provide a medical image diagnostic apparatus capable of performing biosignal synchronous imaging while appropriately measuring a biosignal, and biological measurement device.SOLUTION: The medical image diagnostic apparatus has an acquisition part for acquiring information related to a measurement environment of a biosignal of a subject; and a control part for controlling the operation for examining the subject on the basis of the information related to the measurement environment. The control part stops the progress of the examination of the subject when a charging voltage or an impedance of an electrocardiograph, or an ambient light amount of an optical respiration detection device, or a cycle or an amplitude of an electrocardiograph signal or a respiration signal is not within a specific range.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】生体信号を良好に計測しながら同期撮影を行うことができる医用画像診断装置及び生体信号計測装置を提供すること。【解決手段】医用画像診断装置は、被検体の生体信号の計測環境に係る情報を取得する取得部と、計測環境に係る情報に基づいて、被検体を検査するための動作を制御する制御部とを有する。制御部は心電計の帯電電圧やインピーダンス、光学的呼吸検知装置の周辺光量、心電信号や呼吸信号の周期或いは振幅が所定の範囲内にない場合は被検体検査の進行を停止させる。【選択図】図1