A protective case for a stethoscope includes a first housing and a second housing. The first housing includes a first cavity portion and a first engaging portion. The first cavity portion has a first opening. The first engaging portion is connected to the first opening. The second housing includes a second cavity portion, a second engaging portion, and a bump. The second cavity portion has a second opening. The second engaging portion is connected to the second opening. The second engaging portion is detachably engaged with the first engaging portion, such that the first cavity portion and the second cavity portion form an accommodating space therebetween. The bump is connected to the second cavity portion and protrudes toward the second opening.一種用於保護聽診器的保護盒。保護盒包含第一殼體以及第二殼體。第一殼體包含第一空腔部以及第一銜接部。第一空腔部具有第一開口。第一銜接部與第一開口相連。第二殼體包含第二空腔部、第二銜接部以及凸柱。第二空腔部具有第二開口。第二銜接部與第二開口相連。第二銜接部可拆卸地與第一銜接部銜接，使得一容置空間形成於第一空腔部與第二空腔部之間。凸柱與第二空腔部相連，並朝向第二開口突出。
