Problems of a conventional cover glass sticking device, in which a slide glass having one end side, where a describing portion is formed, is stored in a storage container and the one end side is always projected from level of a protection liquid therein, are solved by the device of the present invention. The device sticks a cover glass onto a sample applied to a slide glass 12 having one end side, where a describing portion is formed, with an enclosure agent, the device comprises: a basket 22 into which the plurality of slide glasses 12 are inserted; a storage container 20 for immersing the basket in a protection liquid, which protects samples on the slide glasses 12, so as to immerse the entire slide glasses 12 therein; a lifting/feeding unit 36 for lifting the basket 22 to project one end side of the slide glass 12 from the level of the protection liquid and feeding the baskets 22 sequentially to a position of a detection sensor 42 for detecting the position of one end side of the slide glass 12 projecting from the protection liquid; a take-out unit 24 for holding a side face of one end side of the slide glass 12, which has been detected by the detection sensor 42, and taking out the slide glass 12 from the protection liquid; and a cage 34 for containing the slide glass 12, on which the cover glass has been stuck to cover the sample.