The purpose of the present invention is to provide: a viscoelastic composition that has excellent manipulability and is suitable for uses in which, when an opaque dark liquid accumulates inside a tube and obstructs the field of view of an endoscope, the liquid is pushed away, securing the field of view of the endoscope； and a method for securing the field of view of an endoscope which involves using the viscoelastic composition. The viscoelastic composition for securing the field of view of an endoscope contains water and a substance exhibiting viscoelastic properties, preferably has a hardness of 550 N/m2 or less, a viscosity (25 DEG C) of 200-2,000 mPa·s, a loss tangent of 0.6 or less, and more preferably, an electrical conductivity of 250 [mu]S/cm or less. The method for securing the field of view of an endoscope involves feeding the viscoelastic composition from the proximal part of the endoscope, through a channel, into the distal part of the endoscope.本發明之目的在於提供一種適於在可見度較差之較深顏色之液體蓄積於管內部而遮住內視鏡之視野時排開該液體而確保內視鏡之視野之用途且操作性優異的黏彈性組合物、及使用該黏彈性組合物之確保內視鏡之視野之方法。本發明係一種內視鏡之視野確保用黏彈性組合物及確保內視鏡之視野之方法，該內視鏡之視野確保用黏彈性組合物含有增黏性物質及水，較佳為硬度為550 N/m2以下，黏度(25℃)為200～2000 mPa・s，損失正切為0.6以下，進而較佳為導電率為250 μS/cm以下，該確保內視鏡之視野之方法係將該黏彈性組合物自內視鏡之手持部通過通道送入至內視鏡之前端部。
