PROBLEM TO BE SOLVED: To allow continuous observation of an image filmed by an imaging part even under a situation where part of transmission channels respectively connected to a plurality of imaging parts is cut.SOLUTION: A medical three-dimensional observation device includes: an acquiring part for acquiring a first signal associated with a first imaging part and a second signal associated with a second imaging part mutually via different transmission channels； and a switching part for switching a signal used for a prescribed control between the first signal and the second signal depending on a state of the transmission channel for transmitting the first signal.SELECTED DRAWING: Figure 1【課題】複数の撮像部それぞれに接続された伝送路のうち一部が切断されるような状況下においても、当該撮像部により撮像された画像の観察を継続可能とする。【解決手段】第１の撮像部に関連付けられた第１の信号と、第２の撮像部に関連付けられた第２の信号とを、互いに異なる伝送路を介して取得する取得部と、前記第１の信号を伝送するための前記伝送路の状態に応じて、所定の制御に利用するための信号を、前記第１の信号と前記第２の信号との間で切替える切替え部と、を備える、医療用立体観察装置。【選択図】図１
