A bubble-removal device (100) includes a main body (100a) having a cylindrical barrel part (110a) and end wall parts (110b, 110c) that close both end parts of the barrel part (110a), and a pipe part extending along a center axis of the barrel part (110a), one end side of which is attached to the end wall part (110c), and the other end side of which is located inside the main body and extends toward the end wall part (110b), wherein in the main body (110), an opening H1 to introduce a refrigerant is formed and an inner surface of the barrel part (110a) has a spiral groove (116) extending spirally relative to the center axis at least on the opening H1 side.