PROBLEM TO BE SOLVED: To provide a stereoscopic observation apparatus for operation capable of easily obtaining an electronic image in directivity of an assistant facing a different direction by 90 degrees from an operator.SOLUTION: In addition to a right/left pair of main optical paths A, a right/left pair of sub optical paths B facing a different direction by 90 degrees are arranged. A right/left pair of imaging elements D1, D2 are installed for each optical path. Accordingly, an electric image can be obtained not only in directivity of a main operator and a person facing the main operator but also in directivity of an assistant positioned on both right/left sides. Therefore, the operator and assistant can cooperate and perform an operation easily.SELECTED DRAWING: Figure 4【課題】術者に対して向きが９０度相違する補助者の方向性での電子映像を容易に得ることができる手術用立体観察装置を提供する。【解決手段】左右一対のメイン光路Ａの他に９０度向きが相違する左右一対のサブ光路Ｂを設け、各光路にそれぞれ左右一対の撮像素子Ｄｌ、Ｄ２を設置しているため、メインの術者とその対向者の方向性でだけでなく、左右両側に位置する補助者の方向性での電子映像も得ることができる。そのため術者と補助者で協力して手術を行いやすい。【選択図】図４
