[PROBLEMS] An adapter for an endoscope can reliably discharge to the outside a liquid, such as bodily fluid, water, chemical liquid, adhering to a distal end surface of the endoscope. [MEANS FOR SOLVING PROBLEMS] The adapter (1) for an endoscope is formed as a tube body having an installation section (2) removably installed on the outer peripheral surface of a distal end surface (Ea) of the endoscope (E) and also having a projection projecting forward of the endoscope (E) from a distal end (2a) of the installation section (2). The installation section (2) has at least one liquid discharge groove (4) opened to an inner space (S) that is formed by an inner peripheral surface (3a) of the projection (3) and by the distal end surface (Ea) of the endoscope (E) and formed depressed in an inner peripheral surface (2c) toward a proximal end (2b), and the installation section (2) also has at least one liquid discharge hole (5) connected to the liquid discharge groove (4) and penetrating through the installation section (2) in its thickness direction to be communicated with an outer peripheral surface (2d). The liquid discharge groove (4) and the liquid discharge hole (5) are formed so that a liquid, such as bodily fluid, water, and chemical liquid, adhering to the distal end surface (Ea) of the endoscope (E) is discharged to the outside by the capillary effect.提供一種能夠讓附著在內視鏡前端面的體液、水、藥液等液體確實排出外部的內視鏡用配接器。內視鏡用配接器(1),是由筒體形成,具備有:可裝卸地安裝在內視鏡(E)前端部(Ea)外圍面的裝接部(2);及從該裝接部(2)前端(2a)朝內視鏡(E)前方突出的突出部(3)。裝接部(2),具備:在突出部(3)的內圍面(3a)和內視鏡(E)前端面(Ea)所形成的內部空間(S)開口,朝基端(2b)凹設在內圍面(2c)的至少一個排液溝槽(4);及連結在該各排液溝槽(4),朝厚度方向貫通著裝接部(2)形成連通於外圍面(2d)的至少一個排液孔(5),排液溝槽(4)及排液孔(5)是形成可讓附著在內視鏡(E)前端面(Ea)的體液、水、藥液等液體利用毛細現象排出外部。1‧‧‧內視鏡用配接器2‧‧‧裝接部2a‧‧‧裝接部前端2b‧‧‧裝接部基端2c‧‧‧裝接部內圍面3‧‧‧突出部3a‧‧‧突出部內圍面4‧‧‧排液溝槽5‧‧‧排液孔D‧‧‧排液孔直徑E‧‧‧內視鏡Ea‧‧‧內視鏡內圍面Eb‧‧‧內視鏡前端面H‧‧‧排液溝槽深度S‧‧‧內部空間W‧‧‧排液溝槽寬度
