Provided are: a transparentizing liquid controlled-release means capable of significantly reducing the time taken for transparentizing effects to be obtained while reducing workload and burden on an organism, and whereby a transparentizing liquid can be stably administered even to a target site in a position opposing gravity and an endoscope and endoscopic surgical tool provided with the same. The present invention has: a rod-shaped member (1) having gas or liquid supply paths (2, 3) inside thereof and openings for each supply path in positions aligned in a circumferential direction in lateral faces in the vicinity of a distal end thereof bag-shaped elastic members (5, 6) provided so as to cover each of the openings of the supply paths in positions aligned in the circumferential direction in the lateral faces in the vicinity of the distal end of the rod-shaped member, the bag-shaped elastic members (5, 6) being controllably expanded and contracted in response to the amount of inflow and outflow of the gas or liquid a transparentizing liquid retaining member (7) for retaining a transparentizing liquid and performing a controlled release of the transparentizing liquid by being pressed, the transparentizing liquid retaining member (7) being fixed to a surface of the bag-shaped elastic member (5) and a bodily fluid adsorbing part (8) for absorbing bodily fluid exiting from a controlled-release target for the transparentizing liquid or dehydrating the controlled-release target for the transparentizing liquid by osmotic pressure, the bodily fluid adsorbing part (8) being fixed to the surface of the bag-shaped elastic member (6).Linvention concerne un moyen à libération contrôlée de liquide de transparence apte à réduire considérablement la durée nécessaire pour obtenir des effets de transparence, tout en réduisant la charge de travail et le poids sur un organisme, et au moyen duquel un liquide de transparence pouvant être administré de façon stable même à un site cible da
