PROBLEM TO BE SOLVED: To provide a waste fluid collector that can facilitate removal of a lid body from a bottle container and that can stably and hygienically perform collecting operation of waste fluid.SOLUTION: The waste collector includes: a bottle container 2 for accumulating waste fluid a cap 3 installed in the upper opening of the bottle container 2 and a lid body 4 that is freely attachably detachably mounted on the cap and that has a waste fluid receiving pipe 4a and an intake pipe 4b. In the lid body 4, there are formed: a lid body part 4A that has a cylindrically formed side wall 4A1 and a ceiling 4A2 formed in the upper end of the side wall and an operation part 4B having a knob 4B5 that is deformed in the center direction of the lid body. When an operating person picks the knob 4B5, the knob 4B5 is deformed in the center direction of the lid body, with the lower end 4B6 of the knob 4B5 brought into contact with the shoulder 2d of the bottle container 2 and, by making the shoulder 2d raised, the lid body 4 is removed from the cap 3.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2016,JPO&INPIT【課題】ボトル容器からの蓋体の取り外し作業を容易に行うことができ、安定的、衛生的に廃液回収作業を行うことができる廃液回収器を提供する。【解決手段】廃液を貯留するボトル容器2と、前記ボトル容器2の上部開口部に設けられたキャップ3と、前記キャップに着脱自在に装着される、廃液受入管4a及び吸気管4bが設けられた蓋体4とを備え、前記蓋体4には、円筒状に形成された側壁4A1と前記側壁の上端に形成された天井部4A2とを有する蓋体本体部4Aと、蓋体の中心方向に変形するつまみ部4B5を有する操作部4Bとが形成され、前記つまみ部4B5を操作者がつまんだ際、つまみ部4B5が蓋体の中心方向に変形し、前記つまみ部4B5の下端部4B6がボトル容器2の肩部2dに接し、前記肩部2dを競りあがることにより、前記蓋体4がキャップ3から外される。【選択図】図5